GMAT prep PS question

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GMAT prep PS question

by mlane25269 » Wed Apr 22, 2009 2:41 pm
Can someone explain? Thanks!
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by DeepakR » Wed Apr 22, 2009 4:51 pm
60 min --- 100 bolts
1min it can make 100/60 ---A

Similarly 60 min --- 150
1min it can make 150/60 --- B

A+B in 1 min = 250/60=25/6
X min = 300
X= 300 * 6/25= 72

Ans B.) = 72

-Deepak