Question

Find the length of a train running at 45 kmph which can cross a bridge of length 250m in 30 sec

Answer 1

The length of the train is 125 metres


Please refer the above photograph for the used process.



KEY POINTS TO REMEMBER :-


☸️ DISTANCE is the product of speed and time.

Mathematically,

$distance = speed \times time$



☸️ A speed in unit Kilometers per hour can be converted into metre per second by multiplying it with 5/18.

And for reverse that is from m/sec to km/hr the magnitude should be multiplied with 18/5



☸️ DISTANCE travelled by the train to cross the bridge is equal to the sum of the length of the bridge and length of the train.

Mathematically,

$distance = bridge + train$



Thanks!