A train speeds past a pole in 25 seconds and a platform 200 m long in 30 seconds. Its length is:	Select the correct option.
A) 1200 m	B) 2000 m	C) 1500 m	D) 1000 m	E) 4000 m
Let the length of the train be x meters and its speed be y m/sec.   They, x / y = 25 =&gt; y = x/25   x + 200 / 30 = x / 25   x = 1000 m.   Answer: Option 1000 m
<result>D</result>
A train speeds past a pole in 25 seconds and a platform 200 m long in 30 seconds. Its length is: