Question

a 250 metre long train is moving at a constant speed of 72 km per hour how much time will it take to cross a bridge 150 metre long​

Answer 1

Time taken by train to completely cross the bridge is 20 seconds

Solution:

Given,

Length of train = 250 meter

Speed of train = 72 km/hr

Length of bridge = 150 meter

To find: Time taken by train to cross the bridge

$Time\ taken = \frac{Total\ distance}{speed\ of\ train }$

Where,

Total distance = Length of train + Length of bridge

Total distance = 250 + 150

Total distance = 400 meter

And,

Speed of train = 72 km/hr

$Speed\ of\ train = 72 \times \frac{5}{18} = 20\ m/s$

Then,

$Time\ taken = \frac{400}{20} \\\\Time\ taken = 20\ seconds$

Thus, time taken by train to completely cross the bridge is 20 seconds

Learn more:

A 250 m long train is running at a speed of 55 km/hr. In how much time will it cross a platform of length 520 m

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A train 250 m long passes a pole in 10 seconds and a bridge in 25 seconds find the length of the bridge

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Answer 2

Answer:

20 sec

Step-by-step explanation:

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