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Q.
Two trains 85 m and 75 m long are running in same direction with speeds of 62 km/hr and 44 km/hr respectively. In what time will the first train cross the second train ?
A.
22 sec
B.
32 sec
C.
42 sec
D.
52 sec
View Answer
Correct choice: B
Explanation:
Given that, 1st train speed = 62 km/hr 2nd train speed = 44 km/hr Hence the relative speed of two trains is : 62-44 = 18 km/hr = 18×5/18 m/s = 5 m/s. There fore, the first train crosses the second train i.e (85+75)mts of distance with a speed of 5m/s in, time = di stance / speed = 85+755 = 32 sec.
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