1.  A and B take part in 100 m race. A runs at 5 kmph. A gives B a start of 8 m and still beats him by 8 seconds. The speed of B is:
A. 5.15 kmph
B. 4.14 kmph
C. 4.25 kmph
D. 4.4 kmph

Answer: Option B

Explanation:

A's speed = 5 x 5 m/sec = 25 m/sec.
18 18

Time taken by A to cover 100 m = 100 x 18 sec
25

    = 72 sec.

Time taken by B to cover 92 m = (72 + 8)

      = 80 sec.

B's speed = 92 x 18 kmph = 4.14 kmph.
80 5