The first train leaves the station at 6:00 am with a speed of 60 km/hr. The second train leaves at 7:30 am, in the same direction from the same station, with a speed of 75 km/hr. What time will the second train catch the first train?  Choose one.
A) 11:30 am
B) 12:30 pm
C) 1:30 pm
D) 2:30 pm
E) 3:30 pm
In ninety minutes, the first train travels 90 km.   The second train catches the first train with a relative speed of 15 km/h.   The second train will catch the first train in 6 hours.   The second train will catch the first train at 1:30 pm.   The answer is 1:30 pm.
<result>C</result>
The first train leaves the station at 6:00 am with a speed of 60 km/hr. The second train leaves at 7:30 am, in the same direction from the same station, with a speed of 75 km/hr. What time will the second train catch the first train?