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Old 02-13-2013, 06:53 PM   #31
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I'd like a hint to know if I'm on the right track.

If you go 90 on the second half, the average speed is 81. Am I right so far?
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Old 02-13-2013, 06:58 PM   #32
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Got it.

I'll pm you herk so I don't ruin it for everyone.
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Old 02-13-2013, 07:00 PM   #33
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It is not possible to average 60 mph.
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Old 02-13-2013, 07:21 PM   #34
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There was a giraffe in there somewhere, so it must be African.
I would have thought that too, but there was also a kangaroo, so this is a multi continental riddle.
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Old 02-13-2013, 07:22 PM   #35
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It is not possible to average 60 mph.
Exactly if you went 1/2 the track at 30MPH you have no time remaining to get a 60 MPH average.

Example: If track was exactly 1 mile long. To average 60 MPH you have 60 seconds to circle the track. At 30 MPH you have traveled 1/2 mile in the allotted 60 seconds. Short of Scotty beaming you instantaneously to the finish line when you hit the 1/2 way mark it can't be done.
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Old 02-13-2013, 07:26 PM   #36
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Exactly if you went 1/2 the track at 30MPH you have no time remaining to get a 60 MPH average.

Example: If track was exactly 1 mile long. To average 60 MPH you have 60 seconds to circle the track. At 30 MPH you have traveled 1/2 mile in the allotted 60 seconds. Short of Scotty beaming you instantaneously to the finish line when you hit the 1/2 way mark it can't be done.
Exactly!
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Old 02-13-2013, 07:33 PM   #37
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Exactly if you went 1/2 the track at 30MPH you have no time remaining to get a 60 MPH average.

Example: If track was exactly 1 mile long. To average 60 MPH you have 60 seconds to circle the track. At 30 MPH you have traveled 1/2 mile in the allotted 60 seconds. Short of Scotty beaming you instantaneously to the finish line when you hit the 1/2 way mark it can't be done.
Who said you had an allotted time to finish?
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Old 02-13-2013, 07:35 PM   #38
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If we are going to throw fun riddles into this discussion, I have a personalized one.

Herk, Turbs, RVChick, and B47 are walking back to their campsite late at night after hiking most of the day. The path that they are following is not lit, but luckily they have one flashlight to share. Along the way, they come to a long, shaky, bridge that they must cross to get over a river. Turbs and RVChick are runners and love the thrill of running across the bridge, so Turbs can cross the bridge in 1 minute, but RVChick is a little slower and can cross in 2 minutes. B47 refuses to run across the bridge, so it takes him 5 minutes to walk the bridge. Herk has a twisted ankle and has to walk slowly, so it takes him 10 minutes to cross the bridge. Only two people can cross the bridge at once; otherwise it might collapse from the weight. If two people cross the bridge at once, they walk or run the bridge at the rate of the slower person so that they can share the flashlight. Anyone crossing the bridge must have the flashlight with him or her; otherwise they cannot see and might fall off of the bridge. The flashlight must be walked back and forth because the bridge is too long to throw the flashlight across.

What’s the shortest time it will take for Turbs, Herk, RVChick, and B47 to all get cross the bridge?
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Old 02-13-2013, 07:45 PM   #39
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If we are going to throw fun riddles into this discussion, I have a personalized one.

Herk, Turbs, RVChick, and B47 are walking back to their campsite late at night after hiking most of the day. The path that they are following is not lit, but luckily they have one flashlight to share. Along the way, they come to a long, shaky, bridge that they must cross to get over a river. Turbs and RVChick are runners and love the thrill of running across the bridge, so Turbs can cross the bridge in 1 minute, but RVChick is a little slower and can cross in 2 minutes. B47 refuses to run across the bridge, so it takes him 5 minutes to walk the bridge. Herk has a twisted ankle and has to walk slowly, so it takes him 10 minutes to cross the bridge. Only two people can cross the bridge at once; otherwise it might collapse from the weight. If two people cross the bridge at once, they walk or run the bridge at the rate of the slower person so that they can share the flashlight. Anyone crossing the bridge must have the flashlight with him or her; otherwise they cannot see and might fall off of the bridge. The flashlight must be walked back and forth because the bridge is too long to throw the flashlight across.

What’s the shortest time it will take for Turbs, Herk, RVChick, and B47 to all get cross the bridge?
Oh man.....I knew I was gonna need paper for this one.....
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Old 02-13-2013, 07:48 PM   #40
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Who said you had an allotted time to finish?
MPH IS a time limit. It measures distance within an hours time.

In my example of a 1 mile track. To average 60 MPH that allows you 1 minute to circle the track. i.e 1 mile per minute = 60 miles per hour. At 30 MPH it takes you 2 mins to complete a mile or 1 minute to complete 1/2 mile. Therefore you ran out of time to complete a mile in 60 seconds or 60 MPH.

I used 1 mile as a simple example...this works out regardless of track length because no matter how long the track...you will have used all the time to drive 1/2 the track needed to average 60 for the whole track.
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