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Question

A 60 m long train moving on a straight level track passes a pole in 5 s. Find the speed of the train and the time it will take to cross a 540 m long bridge.

A
13 ms1, 40 s
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B
25 ms1, 30 s
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C
12 ms1, 50 s
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D
15 ms1, 65 s
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Solution

The correct option is C 12 ms1, 50 s
Given:
Length of the train, D=60 m,
Time taken to cross the pole, T=5 s,
Length of the bridge =540 m

Speed of the train, s=DT

Speed of the train, s=605=12 ms1

Now, distance to be covered to cross a 540 m long bridge is sum of Length of the train and Length of the bridge.
d=60+540=600 m

Time taken=ds

Time taken=60012=50 s

Speed of the train is 12 ms1 and the time it will take to cross the bridge is 50 s.

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