GMAT prep DS question

schumi_gmat: Master | Next Rank: 500 Posts; Posts: 377; Joined: Wed Sep 03, 2008 9:30 am; Thanked: 15 times; Followed by:2 members

by schumi_gmat » Tue Apr 21, 2009 4:09 pm

IMO D

to prove that rate R <5 mile/hr?

Solution:

1) R < 6.4 k/hr i.e R < 6.4/1.6 mile / hr

R< 4 mile/hr............SUFF

2) R < 1/9 km/min

i.e R< 5/1.2 mile / hr

SUFF

ANS D

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ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

by ketkoag » Wed Apr 22, 2009 12:15 am

D for me as well
statement 1 rate less than 6.4km/h
then D/T = 16/6.4 => 2.5
so time is more than 2 hours.
sufficient.

statement 2 took min. 9 mins / kilometer => 9 * 16 => 2hours 24 mins. minimum.
hence sufficient.
Hence D.

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