A train crosses a stationary object in 10 seconds. What is the length of the train if the speed of the train is 25 m/s?
If a train covers a stationary object ,it means that train crosses only it's own length.
Speed of the train 25m/s.
so,that train covers 25m in 1 second.
So, in 10 seconds that train will cover
$$25×10=250$$ meters.
B is correct choice.
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