Speed = Distance / Time
So, Train Speed = Distance / Time.
Points to Remember
To change km/hr into m/sec, we need to multiply it by 5 / 18.
180 km/hr means
180 x 5 / 18
= (10 x 5 )
= 50 m/sec.
And if we need to convert m/sec into km/hr, we multiply it by 18 / 5.
50 m/sec means
50 x 18 / 5
= ( 10 x 18 )
= 180 km/hr.
- Time taken by a train of length l meters to pass a pole or standing man or a signal post is equal to the time taken by the train to cover l meters.
- Time taken by a train of length l meters to pass a stationary object of length b meters is the time taken by the train to cover (l + b) meters.
- Suppose two trains or two objects bodies are moving in the same direction at u m/s and v m/s, where u > v, then their relative speed is = (u – v) m/s.