A train speeds past a pole in 15 seconds and a platform 120 meters long in 25 seconds. What is the length of the train (in meters)?
Select the correct option.
A) 100 m	B) 140 m	C) 130 m	D) 180 m	E) 170 m
Let the length of the train be x meters.   The speed of the train is x / 15.   Then, x + 120 = 25*(x / 15)   10x = 1800   x = 180 meters   The answer is 180 m.
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A train speeds past a pole in 15 seconds and a platform 120 meters long in 25 seconds. What is the length of the train (in meters)?