A man has to be at a certain place at a certain time. He

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A man has to be at a certain place at a certain time. He finds that he shall be 20 minutes late if he walks at 3 km/hour speed and 10 minutes earlier if he walks at a speed of 4 km/hour . The distance he has to walk is

1. 24 km
2. 12·5 km
3. 10 km
4. 6 km

Correct Option: D

Let the required distance be x km.

∴	x	−	x	=	30
	3		4		60

⇒	x	=	1	⇒ x =	1	× 12 = 6 km
	12		2		2