a train 100 meters long completely crosses a 300 meters long bridge in 45 seconds. what is the speed of the train is?	Pick
A) 32 kmph B) 76 kmph C) 34 kmph D) 43 kmph E) 40 kmph
<gadget id="calculator">100 + 300</gadget>
<output>400</output>

<gadget id="calculator">400 / 1_000</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">45 / 3_600</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">(2/5) / (1/80)</gadget>
<output>32</output>

<result>A</result>
a train 100 meters long completely crosses a 300 meters long bridge in 45 seconds. what is the speed of the train is?
divide(divide(add(100, 300), const_1000), divide(45, const_3600))
"s = ( 100 + 300 ) / 45 = 400 / 45 * 18 / 5 = 32 answer : a"