A is 2 1/3 times as fast as B. If A gives B a start of 80 m, how long should the race course be so that both of them reach at the same time?
A.170 metre
B.150 metre
C.140 metre
FeedbackSpeed of A : Speed of B = 7/3 : 1 = 7 : 3 It means, in a race of 7 m, A gains (7-3)=4 meter If A needs to gain 80 metre, race should be of 7/4×80 = 140 metre
D.160 metre
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