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dunkin77: Master | Next Rank: 500 Posts; Posts: 269; Joined: Sun Apr 01, 2007 5:41 am

by dunkin77 » Tue Apr 24, 2007 9:25 am

Hi,

I know the answer should be D) but I just wanted to know how to calculate the answer from 2). <I always have this km/mile min/hr calculation....>

From 1) it's easy rate=4mile per hr, hence 2.5hrs

Thank you!

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Source: Beat The GMAT — Data Sufficiency | Tue Apr 24, 2007 9:25 am

jayhawk2001: Community Manager; Posts: 789; Joined: Sun Jan 28, 2007 3:51 pmFollowed by: 1 member; Location: Silicon valley, California; Thanked: 30 times

by jayhawk2001 » Tue Apr 24, 2007 9:38 pm

For (2), calculate time taken with the minimum stated 9 minutes.

16 km (i.e. 10 miles) can be covered in 16*9 = 144 min at 9 min/km
So, if the time taken is longer than 9 min per km, the time is going to
be > 144 (which is definitely greater than 120 min). Hence sufficient.

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