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# Megan and David start running along the perimeter of a square park. To

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Senior Manager
Joined: 25 Dec 2018
Posts: 488
Location: India
Concentration: General Management, Finance
GMAT Date: 02-18-2019
GPA: 3.4
WE: Engineering (Consulting)
Megan and David start running along the perimeter of a square park. To  [#permalink]

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10 Mar 2019, 09:46
2
1
00:00

Difficulty:

85% (hard)

Question Stats:

38% (03:43) correct 62% (02:56) wrong based on 13 sessions

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Megan and David start running along the perimeter of a square park. To make one round of the park, Megan takes 1 minute and David takes 1 minute and 36 seconds. If both Megan and David burn 24 calories in making one round of the park, in how much time will Megan have burnt 120 calories more than David?

A. 8 minutes 40 seconds

B. 13 minutes 20 seconds

C. 18 minutes 54 seconds

D. 19 minutes 30 seconds

E. A unique value cannot be determined
Senior Manager
Joined: 25 Feb 2019
Posts: 336
Re: Megan and David start running along the perimeter of a square park. To  [#permalink]

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10 Mar 2019, 09:56
3
IMO B .

per second megan burns 24/60 cal

per second david burns 24/96 cal

so.per second megan burns (24/60 - 24/96) cal more than david

= .15 cal

so time to burn 120 cal = 120/.15 = 800 second

13 minutes and 20 second

Posted from my mobile device
Re: Megan and David start running along the perimeter of a square park. To   [#permalink] 10 Mar 2019, 09:56
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