Question

10) A train 150m long is running at 72km/hr. It crosses a bridge in 13 seconds. Find the length of the bridge.​

Answer 1

Answer:

110 metres.

Step-by-step explanation:

LET THE LENGTH OF BRIDGE BE x m.

Distance to be covered by train = ( length of train + length of bridge ) = (150+x) m.

Train's speed = 72 km/hr

Train's speed = (72 × 5/18) m/s = 20 m/s

now, total time taken = distance / speed = (150+x) / 20 seconds

but time is given as 13 seconds.

so, (150+x)/20 = 13

150+x = 13×20 [ Multiplication of 20 on both sides ]

150+x = 260

x = 260-150 [ Subtraction of 150 on both sides ]

x = 110 m.

Therefore , the length of bridge covered by the train = 110 metres.

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