Correct Answer - Option 4 : 18
Given:
Length of the train = 250 m
Time is taken by train to cross the tree = 50 seconds
Formula Used:
Distance = Speed × Time
1m/s = 18/5 km/hr
Calculation:
Speed of the train = lenght of train/ Time taken by train
Speed of the train = 250/50 ⇒ 5 m/s
Converting the m/s to km/hr
⇒ 5 m/s × 18/5 = 18 km/hr
∴ The speed of the train is 18km/hr