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by ricky » Mon Jul 28, 2008 7:18 am
Let x be the distance of one side.

Total time taken = 105 mins= 105/60= 7/4 hrs

Since time= distance/speed

time taken to travel one-way + time taken to come back(same way)= total time

=> x/3 + x/4 =7/4

=> x= 3; which distance of one side or length of trail(as asked in the question).
Last edited by ricky on Mon Jul 28, 2008 7:33 am, edited 1 time in total.
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by sudhir3127 » Mon Jul 28, 2008 7:18 am
My Answer is 6.

Yes u have 2 convert 105 minutes into hours..

average speed forumula =( 2*X*Y/X+Y)
= 2*4*3/7= 24/7

time taken 105 minutes = 105/60 hrs = 7/4 hrs

there fore the distance = 24/7*7/4 = 6.

hope its clear
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by ricky » Mon Jul 28, 2008 7:32 am
The question is asking about the trail length, which is 3.

So 6, which is total journey, is incorrect!
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by sudhir3127 » Mon Jul 28, 2008 7:38 am
thanks ricky,.... yeah its the total distance which has to be divided by 2.

got it ...
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by dandillion » Mon Jul 28, 2008 8:59 am
Thank you very much! Didn't have to multiply by 2! :D
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