A train sets off at 9:00 am at the speed of 70 km/h. Another train starts at 9:30 am in the same direction at the rate of 80 km/h. At what time will the second train catch the first train? Options
A) 12:30	B) 1:00	C) 1:30	D) 2:00	E) 2:30
In thirty minutes the first train travels 35 km.   The second train catches the first train at a rate of 80 km/h - 70 km/h = 10 km/h.   The second train will catch the first train in   35/10= 
<gadget id="calculator">  35/10</gadget>
<output>7/2 = around 3.5</output>
3.5 hours, so at 1:00 pm.   The answer is 1:00.
<result>B</result>
A train sets off at 9:00 am at the speed of 70 km/h. Another train starts at 9:30 am in the same direction at the rate of 80 km/h. At what time will the second train catch the first train?