A train speeds past a pole in 10 seconds and a platform 150 m long in 25 seconds. Its length is: Pick:
A) 300 m.
B) 250 m.
C) 100 m.
D) 200 m.
E) 150 m.
Let the length of the train be x meters and its speed be y m/sec.   They, x / y = 10=&gt; y = x/10   x + 150 / 25 = x / 10   x = 100 m.   Answer: Option 100 m.
<result>C</result>
A train speeds past a pole in 10 seconds and a platform 150 m long in 25 seconds. Its length is: