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1. A and B take part in a 100 metres race. A runs at 5 km an hour. A gives B a start of 8 metres and still beats him by 8 seconds. The speed of B is ?

Solution:
A's speed = 5 km/hr
= (5×518)  m/sec
= 2518 m/sec
Time taken by A to cover 100 metres
= (100×1825)
= 72 sec
Time taken by B to cover 92 metres
= (72 + 8) sec
= 80 sec
B's speed
9280 m/sec
= (9280×185)  km/hr
= 414100 km/hr
= 4.14 km/hr

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