a train speeds past a pole in 10 seconds and a platform 50 m long in 20 seconds. its length is: Answers.
A) 30 m .	B) 40 m .	C) 60 m .	D) 50 m .	E) 70 m .
<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">50 * 1</gadget>
<output>50</output>

<result>D</result>
a train speeds past a pole in 10 seconds and a platform 50 m long in 20 seconds. its length is:
multiply(50, subtract(const_2, const_1))
"let the length of the train be x meters and its speed be y m / sec . they , x / y = 10 = > y = x / 10 x + 50 / 20 = x / 10 x = 50 m . answer : option d"