A train speeds past a pole in 15 sec and a platform 130 m long in 25 sec, its length is?  Choose one.
A) 50 m
B) 150 m
C) 195 m
D) 300 m
E) None of these
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 + 130)/25 = x/15 =&gt; x = 195 m.   ANSWER:195 m
<result>C</result>
A train speeds past a pole in 15 sec and a platform 130 m long in 25 sec, its length is?