Practice | Hashtable

1. In a 200 metres race A beats B by 35 m or 7 seconds. A's time over the course is:

A. 40 sec

B. 47 sec

C. 33 sec

D. None of these

Solution:

B runs 35m in 7sec
∴ B covers 200m in

\frac{7}{35} \times 200 = 40 \sec

B's time over the course = 40 sec
∴ A's time over the course (40 - 7) sec = 33 sec

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