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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:

5.15 kmph
4.14 kmph
4.25 kmph
4.4 kmph

Correct Answer: 4.14 kmph

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	= 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

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