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Q.
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?
A.
27 7/9 mts
B.
25 8/7 mts
C.
21 1/4 mts
D.
22 mts
View Answer
Correct choice: A
Explanation:
Relative speed = (40 - 20) km/hr = ( 20 x 5/18) m/sec = ( 50/9) m/sec. Length of faster train = ( 50/9 x 5 ) m = 250/9 m = 27 7/9 m.
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