A 300 metre long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds...........

Quantitative Aptitude(IBPS PO) Problems on trains

A 300 metre long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform?

310 m

350 m

600 m

490 m

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Explanation:

when it cross a pole actually it is crossing itself
so, S = 300/18
let length of platform be “p”
relative speed = total lengths/time
speed of train = [300 + p ]/39
(300/18)x39=300 +p
650 -300=p
p=350 m
Note : in this type of question one thing is pole,man and other is of considerable length like platform ,bridge.
when train crosses pole,man it crosses itself