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Walk

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Director
Director
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Joined: 01 Apr 2008
Posts: 909
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 15

Kudos [?]: 236 [0], given: 18

Walk [#permalink] New post 24 Aug 2009, 00:57
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (01:48) wrong based on 2 sessions
Tom and Linda stand at point A. Linda begins to walk in a straight line away from Tom at a constant rate of 2 miles per hour. One hour later, Tom begins to jog in a straight line in the exact opposite direction at a constant rate of 6 miles per hour. If both Tom and Linda travel indefinitely, what is the positive difference, in minutes, between the amount of time it takes Tom to cover the exact distance that Linda has covered and the amount of time it takes Tom to cover twice the distance that Linda has covered?

A 60
B 72
C 84
D 90
E 120
Senior Manager
Senior Manager
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Joined: 27 May 2009
Posts: 282
Followers: 2

Kudos [?]: 71 [0], given: 18

Re: Walk [#permalink] New post 24 Aug 2009, 01:09
IMO D:

Toms distance=6t
linda's distnce = 2(t+1)

they are equal

so t comes out to be 30 mins or 1/2

when tom will cover twice the difference....

6t= 2 *2(t+1)

t= 120 mins or 2 hours

thus differnce between bot the t's would be 90 mins or 3/2 hours...


Pls correct me if i wrong............
Manager
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Joined: 28 Jul 2009
Posts: 126
Location: India
Schools: NUS, NTU, SMU, AGSM, Melbourne School of Business
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Kudos [?]: 55 [0], given: 12

Re: Walk [#permalink] New post 24 Aug 2009, 02:07
rohansherry wrote:
IMO D:

Toms distance=6t
linda's distnce = 2(t+1)

they are equal

so t comes out to be 30 mins or 1/2

when tom will cover twice the difference....

6t= 2 *2(t+1)

t= 120 mins or 2 hours

thus differnce between bot the t's would be 90 mins or 3/2 hours...


Pls correct me if i wrong............


Bingo.
Tom starts when Linda is 2 miles away. Tom's speed is 6mph. Therefore, in 30 mins, both will be 3 miles apart frm A. (Same Distance)

After 120 mins(2 hours), Tom would have covered double the distance of Linda.

Positive Difference : 120-30 = 90 !!
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Re: Walk   [#permalink] 24 Aug 2009, 02:07
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