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eshwarjayanth: Senior | Next Rank: 100 Posts; Posts: 40; Joined: Mon Oct 18, 2010 8:32 am

by eshwarjayanth » Thu Aug 25, 2011 10:37 pm

not sure of the answer I selected C and it was wrong

Source - Kaplan practice

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Source: Beat The GMAT — Problem Solving | Thu Aug 25, 2011 10:37 pm

snakedoc: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Fri Nov 19, 2010 5:56 pm; Thanked: 4 times

by snakedoc » Fri Aug 26, 2011 2:25 am

The Answer is C itself.

In First case it is .25hr and in second case it is .5hr so the difference is .25hr

Please correct me if I am wrong.

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gmatboost: Master | Next Rank: 500 Posts; Posts: 312; Joined: Tue Aug 02, 2011 3:16 pmFollowed by: 33 members; Location: New York City; Thanked: 130 times; GMAT Score:780

by gmatboost » Fri Aug 26, 2011 8:15 am

C is correct, unless we have all misinterpreted the question.

In the first case,
2 + 4x = 12x
2 = 8x
x = 0.25

In the second case,
(3/2)(2 + 4x) = 12x
3 + 6x = 12x
3 = 6x
x = 0.5

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