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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?



Length of train= 300m 
time taken to cross platform= 39 sec
time taken to cross signal pole= 18 sec
speed of the train while crossing platform = 300/39= 7.69m/sec
speed= distance/time
7.69= distance/39
hence distance = 7.69*39= 299.91m
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