A train 400 meters long completely crosses a 300 meters long bridge in 45 seconds. What is the speed of the train is? Choose the correct choice from the following answers:	A) 32	B) 56	C) 29	D) 27	E) 21
S = (400 + 300)/45 = 700/45 * 18/5= 
<gadget id="calculator">700/45 * 18/5</gadget>
<output>56</output>
56   Answer: 56
<result>B</result>
A train 400 meters long completely crosses a 300 meters long bridge in 45 seconds. What is the speed of the train is?