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
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Answered by
3
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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