A 120 mts long train crosses a tree in 6 seconds. What is the speed of the train in kilometer per hour?
Answer: (4) 72 km/hr
The length of the train = 120 m
Time taken by train to crosses a tree = 6 sec
Then, the speed of the train = 120/6
= 20 m/sec
Speed in km/hr = 20 x 18/5
= 4 x 18
= 72 km/hr
Hence, the answer is (4) 72 km/hr.