A train leaves Mumabai at 9 am at a speed of 40 kmph. After one hour, another train leaves Mumbai in the same direction as that of the first train at a speed of 50 kmph. When and at what distance from Mumbai do the two trains meet?  Choose the correct choice from the following.
A) 287	B) 279	C) 200	D) 278	E) 379
When the second train leaves Mumbai the first train covers 40 * 1= 
<gadget id="calculator">40 * 1</gadget>
<output>40</output>
40 km   So, the distance between first train and second train is 40 km at 10.00am   Time taken by the trains to meet= Distance / relative speed = 40 / (50 -40)= 
<gadget id="calculator">40 / (50 -40)</gadget>
<output>4</output>
4 hours   So, the two trains meet at 2 p.m. The two trains meet 4 * 50= 
<gadget id="calculator">4 * 50</gadget>
<output>200</output>
200 km away from Mumbai.   Answer:200
<result>C</result>
A train leaves Mumabai at 9 am at a speed of 40 kmph. After one hour, another train leaves Mumbai in the same direction as that of the first train at a speed of 50 kmph. When and at what distance from Mumbai do the two trains meet?