7. A passenger train 100m long is moving with a uniform velocity 45 kmph. The time taken to
cross a stationary goods train of length 1km is [ ]
a) 80s b) 94s c) 88s d) 78s
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7. A passenger train 100m long is moving with a uniform velocity 45 kmph. The time taken to
cross a stationary goods train of length 1km is [ ]
a) 80s b) 94s c) 88s d) 78s
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Answer:
Answer is 88 sec
Explanation:
Given that the passenger train is 100 m long &
the goods train is 1 km long
=> If the passenger train to completely cross the stationary goods train it should travel 1100 m
i.e Distance to be traveled = length of goods train + length of passenger train.
=> Distance = 1100 m
It is also given that the train is moving in uniform velocity 45 kmph
to convert it into m/s multiply it with 5/18
=> velocity = 45 × 5/18
=> velocity = 12.5 m/s
Now, We know that
Time = Distance/Velocity
=> Time = 1100/12.5 = 88 sec
=> Time taken for the passenger train to completely cross the stationary goods train is 88 sec