In a 100 m race A takes 15 seconds and B takes 18 seconds. How many metres’ start should A give B so that they finish together?
Correct answer B. 16 2/3 m
Explanation
B's speed = 100/18 m/s. In A's 15 seconds B runs 1500/18 = 83 1/3 m, so B needs a start of 16 2/3 m.
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