alleryIn a 100 m race A needs 20 s and B needs 25 s. How far behind is B when A finishes?
A25 m
B10 m
C15 m
D20 m
Answer & Solution
Correct answer: D. 20 m
B runs 4 m/s, so in 20 s he covers 80 m and is 20 m short.
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