hours

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dandillion: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Sat Jul 26, 2008 2:04 pm

by dandillion » Mon Jul 28, 2008 6:58 am

Please, help me out with this question, i don't know whether i should convert 105 minutes into hours or not. I'm not getting the right answer in any case.

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Source: Beat The GMAT — Problem Solving | Mon Jul 28, 2008 6:58 am

ricky: Master | Next Rank: 500 Posts; Posts: 118; Joined: Sun Jun 01, 2008 1:47 pmFollowed by: 1 member; Thanked: 5 times

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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sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pmFollowed by: 3 members; Location: INDIA; Thanked: 84 times

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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ricky: Master | Next Rank: 500 Posts; Posts: 118; Joined: Sun Jun 01, 2008 1:47 pmFollowed by: 1 member; Thanked: 5 times

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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sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pmFollowed by: 3 members; Location: INDIA; Thanked: 84 times

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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dandillion: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Sat Jul 26, 2008 2:04 pm

by dandillion » Mon Jul 28, 2008 8:59 am

Thank you very much! Didn't have to multiply by 2!

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