Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train?

23 m
23 2⁄9 m
27 7⁄9 m
29 m

Correct Answer: 27 7⁄9 m

Explanation:

Relative speed = (40 - 20) km/hr =	❨	20 x	5	❩	m/sec =	❨	50	❩	m/sec.
			18				9

∴ Length of faster train =	❨	50	x 5	❩	m =	250	m = 27	7	m.
		9				9		9

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