A train speeds past a pole in 15 seconds and a platform 100 m long in 30 seconds. Its length is?
Choose the correct option
A) 188 m B) 876 m C) 251 m D) 200 m E) 145 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 / 30= x / 15   x = 200 m.   Answer: 200 m
<result>D</result>
A train speeds past a pole in 15 seconds and a platform 100 m long in 30 seconds. Its length is?