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A and B take part in a 100 m race. A runs at 5 Km/h. A gives B a start of 8 m and still beat him by 8 sec. Speed of B is :
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- 5.15 km/h
- 4.14 km/h
- 4.25 km/h
- 4.4 km/h
Correct Option: B
A’s speed = (5 * 5 / 18) m/sec = 25 / 18 m/sec
Time taken by A to cover 100 m = (100 * 18 / 25) sec = 72 seconds.
∴ B covers 92 m in 72 + 8 = 80 seconds.
B’s speed = (92 / 80 * 18 / 5) Km/h = 4.14 Km/h.
