A train speeds past a pole in 15 sec and a platform 120 m long in 25 sec, its length is?  Choose the correct choice from the following answers: A) 100 B) 150 C) 160 D) 170 E) 180
Let the length of the train be x m and its speed be y m/sec.   Then, x/y = 15 =&gt; y = x/15   (x + 120)/25 = x/15 =&gt; x = 180 m.   Answer: Option 180
<result>E</result>
A train speeds past a pole in 15 sec and a platform 120 m long in 25 sec, its length is?