Question

a train crosses a platform 90 m long in 30 seconds and a man standing on the platform in 15 seconds find the speed of the train.
solve it...in detail​

Answer 1

Answer:

Let the speed of the train be x m/sec and length of the train be y m. Then,

Speed of the train

Length of the train

= Time taken by the train to pass the man

⇒

x

y

=15⇒y=15x ......... (1)

and

Speed of train

Length of train + Length of platform

= Time taken by the train to cross the platform

⇒

x

y+90

=30⇒y+90=30x ........ (2)

Put the value of y from (1) in (2)

15x+90=30x⇒15x=90⇒x=6m/sec

∴ Speed of train =(6×

5

18

)km/hr=21.6km/hr.

Answer 2

Answer:

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