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GMATPrep Work Problem

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by rosh26 » Thu Sep 11, 2008 4:02 pm
Old Rate: 100

New Rate: 150

Old + New = 250

R=250
T=?
W=300

? = 6/5 = 1 hr and 12 min = 72 min....

Answer B

OA???
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by shahab03 » Thu Sep 18, 2008 12:19 pm
in 1 hr old m/c makes = 100 bolts
in 1 hr new m/c makes = 150 bolts
in 1 hr old+new m/c make = 100+150=250 bolts

300 bolts can be done in = (300/250)*60 mins = 72 mins

answer = B
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by stop@800 » Thu Sep 18, 2008 12:58 pm
250 bolts in 1 hr
we need 50 more
that 1/5 extra

so 60 + 60/5 minutes
72 minutes
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