a train 400 m long is travelling at the speed of 72 km per hour. how long will it take to cross a lamp post ?
Answers
Answered by
2
Answer:
Length of the train = Distance covered by it to cross the lamp post
Therefore, Distance = 400 m
Speed = 72 km per hour
= 72×5/18 metre per second
= 4 × 5 metre per second
= 20 metre per second
Now , The formula of time = Distance / Speed
= 400/20 seconds
= 20 seconds. ( Ans )
Answered by
1
Answer:
10s
Step-by-step explanation:
a train 400 m long is travelling at the
speed of 72 km per hour
speed= 72*5/9=40 m/s
time= distance/speed=400/40=10s
time taken to cross a lamp post =10 sec
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