A train 200 meters long completely crosses a 300 meters long bridge in 45 seconds. What is the speed of the train is? Choose the correct choice
A) 10  B) 20  C) 30  D) 40  E) 50
S = (200 + 300)/45 = 500/45 * 18/5= 
<gadget id="calculator">500/45 * 18/5</gadget>
<output>40</output>
40   ANSWER:40
<result>D</result>
A train 200 meters long completely crosses a 300 meters long bridge in 45 seconds. What is the speed of the train is?