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

Question

A train crosses a man running in opposite direction in 21 seconds and same train crosses a 240 meters long platform in 33 seconds.
If the speed of the man is 15 km/hr, then what is the speed of the train?

Answer 1

650 m

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300 m - 18 sec
X m - 39 sec
X = 300*39/18= 650 m