Train A and Train B began traveling towards each other from opposite ends of a 420-mile long track at 1:00 PM. If Train A traveled at 35 miles per hour and Train B traveled at 25 miles per hour, at what time did the trains meet?	Choose the correct choice from the following answers:	A) 5:40 PM	B) 6:00 PM	C) 7:20 PM	D) 8:00 PM	E) 9:20 PM
This question tests your concepts of relative speed:   If two trains are moving in opposite direction, then distance will reduce at a rate of (Speed of 1 + Speed of 2)   If two trains are moving in same direction, then distance will reduce at a rate of (Speed of 1 - Speed of 2)   Here the trains are moving towards each other, hence in opposite direction.   Trains will cover the 500 mile track in a time of 500/(25 + 35) =420/60= 
<gadget id="calculator">420/60</gadget>
<output>7</output>
7 hours   Trains started at 1:00 PM, there they will meet at 8:00 PM   Option 8:00 PM
<result>D</result>
Train A and Train B began traveling towards each other from opposite ends of a 420-mile long track at 1:00 PM. If Train A traveled at 35 miles per hour and Train B traveled at 25 miles per hour, at what time did the trains meet?