a 240 m long train running at the speed of 120 km / hr crosses another train running in opposite direction at the speed of 80 km / hr in 9 sec. what is the length of the other train? Answers.
A) 260	B) 250	C) 240	D) 230	E) 220
<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<gadget id="calculator">10 / 36</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">200 * (5/18)</gadget>
<output>500/9 = around 55.555556</output>

<gadget id="calculator">(500/9) * 9</gadget>
<output>500</output>

<gadget id="calculator">500 - 240</gadget>
<output>260</output>

<result>A</result>
a 240 m long train running at the speed of 120 km / hr crosses another train running in opposite direction at the speed of 80 km / hr in 9 sec. what is the length of the other train?
subtract(multiply(multiply(add(120, 80), const_0_2778), 9), 240)
"relative speed = 120 + 80 = 200 km / hr . = 200 * 5 / 18 = 500 / 9 m / sec . let the length of the other train be x m . then , ( x + 240 ) / 9 = 500 / 9 = > x = 260 . answer : option a"