A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is?  Pick:  A) 180 m  B) 1870 m  C) 050 m  D) 150 m  E) 110 m
Let the length of the train be x meters and its speed be y m/sec.   They, x / y = 15 =&gt; y = x/15   x + 100 / 25 = x / 15   x = 150 m.   Answer:150 m
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A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is?