Question

how long will a 15 m long train travelling at 72km/h take to crass a pole​

Answer 1

Answer:

length of the train=50m

speed=72km per hr=72000/3600=20m/sec

total dist to be covered=50m

20m=1 sec

1m= 1/20 sec

50 m=1/20*50=5/2sec=2.5 sec

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Convert 72 km per hour into metre per second by multiplying it by 5 by 18 which is equal to 20 metre per second now if the train has to completely pass the pole the rear end of the train should cross the pole hence the train will travel 50 m hence it will take 50 by 20 that is 2.5 seconds to cross the pole

Step-by-step explanation:

hope it helps

Answer 2

Answer:

Step-by-step explanation:

Speed= 72km/hr= 20m/sec

Distance=15m

As, if a train crosses a pole it covers its own distance.

So, Time= 15/20