a train is 360 meter long is running at a speed of 45 km / hour. in what time will it pass a bridge of 140 meter length.  Choose the correct option:
A) 20 seconds B) 27 seconds C) 30 seconds D) 40 seconds E) 50 seconds
<gadget id="calculator">360 + 140</gadget>
<output>500</output>

<gadget id="calculator">45 * 1_000</gadget>
<output>45_000</output>

<gadget id="calculator">45_000 / 3_600</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">500 / (25/2)</gadget>
<output>40</output>

<result>D</result>
a train is 360 meter long is running at a speed of 45 km / hour. in what time will it pass a bridge of 140 meter length.
divide(add(360, 140), divide(multiply(45, const_1000), const_3600))
"speed = 45 km / hr = 45 * ( 5 / 18 ) m / sec = 25 / 2 m / sec total distance = 360 + 140 = 500 meter time = distance / speed = 500 ∗ 2 / 25 = 40 seconds answer : d"