1.

find the time taken by a 110 metre long train to cross a platform 90m long of its speed is 30 kilometre per hour​

Answer»

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.


Discussion

No Comment Found

Related InterviewSolutions