Question

Find the length of acro bridge in which a train140 m long travelling at 54 kmph can cross in 30 seconds

Answer 1

Step-by-step explanation:

Speed of train = 54 km /hr

1 km = 1000 m

1 hr = 3600 sec

Speed of train in m/s = 54 * 1000 / 3600

= 15 m/s

Distance = Speed * time

=> Distance covered in 30 secs = 15 * 30 = 450 m

Length of train = 140 m

Length of bridge = 450-140 = 310 m

Length of bridge = 310 m

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Answer 2

Answer:

Length of bridge is 310 meter

Step-by-step explanation:

Distance = speed × time

Here distance = length of train + length of bridge

let. distance = 140 + x

speed = 54 kmph

= 54 × 1000/(60×60) m/s

= 15 m/s

time = 30 s

So ,

140 + x = 15 × 30

x = 450 - 140

= 310 meter

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