Question

7.
A train 150 m long is running at 72 km/hr. It crosses a bridge in 13 seconds. Find
the length of the bridge.[by variation method]​

Answer 1

Answer:

(length of bridge + length of train) = speed of train * time to cross bridge

So:

x + 150 = 72km/h * 13s

Convert 72km/h to m/s => 72000m/3600s => 20m/s (speed of train)

Now, solve:

x + 150m = 20m/s *13s => x + 150m = 260m => x = 260m - 150m => x = 110m (length of bridge)

Step-by-step explanation:

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Answer 2

Answer:

first find the speed of train in seconds then divide its length through the number which you get in seconds then just multiply it with 13 seconds then you will get the answer.

hope it's helpful