A train sets off at 9:00 am at the speed of 70 km/h. Another train starts at 10:30 am in the same direction at the rate of 84 km/h. At what time will the second train catch the first train? Choose the correct choice from the following
A) 4:30 B) 5:00 C) 5:30 D) 6:00 E) 6:30
In one hour and thirty minutes the first train travels 105 km.   The second train catches the first train at a rate of 84 km/h - 70 km/h = 14 km/h.   The second train will catch the first train in   105/14= 
<gadget id="calculator">  105/14</gadget>
<output>15/2 = around 7.5</output>
7.5 hours, so at 6:00 pm.   The answer is 6:00.
<result>D</result>
A train sets off at 9:00 am at the speed of 70 km/h. Another train starts at 10:30 am in the same direction at the rate of 84 km/h. At what time will the second train catch the first train?