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Tough and tricky 5: Race [#permalink]
11 Oct 2009, 17:14
This post was BOOKMARKED
45% (00:00) correct
55% (06:18) wrong based on 18 sessions
A and B ran, at their respective constant rates, a race of 480 m. In the first heat, A gives B a head start of 48 m and beats him by 1/10th of a minute. In the second heat, A gives B a head start of 144 m and is beaten by 1/30th of a minute. What is B’s speed in m/s? (A) 12 (B) 14 (C) 16 (D) 18 (E) 20 _________________