A train speeds past a pole in 15 seconds and a platform 140 meters long in 25 seconds. What is the length of the train (in meters)? Answers:
A) 190
B) 200
C) 210
D) 220
E) 230
Let the length of the train be x meters.   The speed of the train is x / 15.   Then, x + 140 = 25*(x / 15)   10x = 2100   x = 210 meters   The answer is 210.
<result>C</result>
A train speeds past a pole in 15 seconds and a platform 140 meters long in 25 seconds. What is the length of the train (in meters)?