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A moving train passes a platform 50 metr...

A moving train passes a platform 50 metre long in 14 seconds and a lamp post in 10 seconds. The speed of the train (in km/h) is

A

24

B

36

C

40

D

45

Text Solution

Verified by Experts

The correct Answer is:
D
यदि रेलगाड़ी की लम्बाई y हो, तो रेलगाड़ी की चाल `=(y +50 )/(14 ) = (y)/(10)`
` implies 14 y-10 y =500`
` implies 4y =500`
` implies y=125 m`
` therefore `रेलगाड़ी की चाल `=(125)/(10) xx (18)/(5)`
`=45 km//h`
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