Important notes and formula

N km/hr = | N x | 5 | m/s | ||

18 |

N m/s = | N x | 18 | km/hr | ||

5 |

Time taken by a train of length L meters to cross a person standing on a platform, or a signal pole or a lamp post is equal to the time taken by the train to cover L meters.

Time taken by a train of length L meters to cross a platform or object of length X is equal to the time taken by the train to cover (L + X) meters.

If two trains are running in opposite direction at a speed u m/s and v m/s respectively then their relative speed is (u+v) m/s.

If two trains are running in same direction at a speed u m/s and v m/s respectively then their relative speed is (u-v) m/s where, u > v.

If two trains L meters and M meters are running in opposite direction at a speed u m/s and v m/s respectively.

Then time taken by the trains to cross each other is

(L + M) / (u + v) seconds.

If two trains L meters and M meters are running in same direction at a speed u m/s and v m/s respectively where, u > v.

Then time taken by the faster train to cross the slower train is

(L + M) / (u - v) seconds.

If two trains start from point A and B respectively at the same time and starts approaching each other and after crossing they take x and y seconds respectively to reach point B and A respectively. Then speed of the two trains will be

u : v = √x : √y

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