Two train are running in opposite direction with a speed of 62 kmph and 40 kmph respectively. If the length of one train is 250 meters and they cross each other in 18 seconds, the length of the other train is?

145 metres
230 metres
260 metres
Cannot be determined

Correct Answer: 260 metres

Explanation:

Let the length of another train be L meters.
Their relative speed = (62 + 40) km/hr = 102 x (5/18) = (85/3) m/sec
∵ 250 + L/(85/3) = 18
⇒ 3(250 + L)/85 = 18
⇒ 250 + L = 510
⇒ L = 260
∴ Length of another train = 260 meters

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