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Races and Games - General Aptitude

Q1:

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 kmphv

C 4.25 kmph

D 4.4 kmph

ANS:B - 4.14 kmphv

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 = 72 sec.
25
Time taken by B to cover 92 m = (72 + 8) = 80 sec.
B's speed = 92 x 18 kmph = 4.14 kmph.
80 5