(A) 30 km/hr
(B) 72 km/hr
(C) 76 km/hr
(D) 92 km/hr
Correct Option is: B
Length of the train = 560 m
Length of the platform = 340 m
Therefore, length of the train + length of the platform = 560 m + 340 m = 900 m
Time taken by the train to cross the platform = 45 sec
Therefore, speed of train = 900 m / 45 m/sec = 20 m/sec
To convert the speed from m/sec to km/hr, multiply by 18/5
Therefore, speed of the train = 20 × 18/5 km/hr = 72 km/hr