Question

The speed of a train is 120 m/sec. If it takes 15 second to cross a electric pole . Find the time required for it to cover a platform of 240 metres.

a.15sec
b.16sec
c.17sec
d.18sec​

Answer 1

Answer:

Speed of train =120km/hr=120×

18

5

m/s=

3

100

m/s

Time taken to cross the electric pole = 9 sec

∴ Length of the train =(

3

100

×9)m=300m

Let the length of the platform be x m.

Then a distance of (x + 300) m is to be covered in 24 seconds at speed of

3

100

m/s

∴(x+300)=(

3

100

×24)m

⇒x+300=800

⇒x=500m

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