Question

a railway train 200m long moves with a speed of 72 km/h inverse.calculate the time taken by the train to cross a bridge 0.8km long ?​

Answer 1

length of bridge is equal to 0.8 kilometre which is equal to 800 metres

length of railway train is equal to 200800 metres .

install distance that the train will cover is equal to length of bridge + length of railway train .

mathematically ,

800+200 = 1000 metres = 1 kilometre.

speed of train is equal to 72 kilometre per hour .

hence,

Time is equal to Distance/speed

Thus,

Time is

$t = \frac{1}{72} \\ \\ \\t = \frac{1}{72} \times 3600 = 50 \: seconds$