Question

train is 150 M long is running at 7
2 km per hour it crosses a bridge in 13 seconds find the length of the bridge

Answer 1

We can solve using this equation:
 (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)


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Answer 2

length of train is 150 m
let bridge =x m
S=72km /h=20m/s
total dis =150+x metre 
t=d/s
13=150+x/20
260-150=x
bridge lenght =110m