A 300 metre long train crosses a platform in 39 seconds while it crosses a post in 18seconds What is...........

Quantitative Aptitude (CSC) Problems on trains

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

350m

380m

260m

245m

Solution:
Let the length of the platform be x.
(x+300):300=39:18
(x+300):300=13:6
6x+1800=3900
x=350m.

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