a train, 100 m long is running at a speed of 54km/ hr. if it crosses a bridge in 12 sec, find the length of the bridge.
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Answer:
54*5/18 = 15 m/s
15=100/12+x/12
180-100=x
Bridge = 80m long
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Step-by-step explanation:
sum of length of bridge and train
__________________________= time taken by
speed of train. train to pass
the bridge
length of train= 100m
length of bridge= X
time taken to cross the bridge= 12 sec
speed of train= 54 km/hr= 15 m/ sec
Therefore,
100+X/15=12
100+X= 12*15
100 + X = 180
X= 180-100
X= 80
ANSWER= length of bridge is 80 m
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