a-train-speeds-past-a-pole-in-15-seconds-and-a-platform-100-m-long-in-25-seconds.-its-length-is:-5e8ac8f1a107e59f202a02bd

A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:

50 m
150 m
200 m
Data inadequate

Let the length of the train be x metres and its speed by y m/sec.

Then,	x	= 15 y =	x	.
	y		15

	x + 100	=	x
	25		15

15(x + 100) = 25x

15x + 1500 = 25x

1500 = 10x

x = 150 m.