A train speeds past a pole in 15 sec and a platform 150 m long in 25 sec, its length is? Choose the correct choice from the following answers
A) 100	B) 150	C) 160	D) 225	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 + 150)/25 = x/15 =&gt; x = 225 m.   Answer: Option 225
<result>D</result>
A train speeds past a pole in 15 sec and a platform 150 m long in 25 sec, its length is?