A train is moving at a speed of 20 m s and crosses a pole in 8 seconds How long will it take to cros...........

Quant (SSC) Problems on trains

A train is moving at a speed of 20 m/s and crosses a pole in 8 seconds. How long will it take to cross another train which is running in opposite direction at double speed and half the length of the first train?

छोटे Courses बड़े Results

Master Problems on trains

Prepare through Micro-courses

Try Now

Explanation:

Since the speed of the train is 20 m/s and it takes 8 seconds to cross the pole,
so the length of the train is 20 × 8 = 160 metres
Now the other train is coming at double speed = 40 m/s and its length is half = 80 metres
So the total length to be crossed becomes = 160 + 80 = 240 meters
And the relative speed becomes 40 + 20 = 60 m/s
Therefore, the time taken = 240 /60 = 4 sec.