Question

a train 400 metres long is travelling at a speed of 45km/hr. how long will it take to cross an electric pole

Answer 1

Step-by-step explanation:

Given, the length of train is = 400 metres

And the speed of train = 45 km/hr

Solution:

Change 45 km/hr into metre/second.

( Remember - When we convert km/hr into m/sec we multiply by 5/18 and when change m/sec into km/hr we multiply by 18/5).

So, (45 × 5/18) m/sec .

=). 25/2 m/sec

=). 12.5 m/sec

Now, Distance = 400 metres

and Speed = 12.5 m/sec

Time = ?

Time = Distance/ Speed

Time = 400/12.5

" = 4,000/125

" = 32 seconds Answers

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