A and B are two stations 125km apart. A train starts from A at 6a.m. and travels towards B at 50kmph. Another train starts from B at 7a.m. and travels towards A at 25kmph. At what time do they meet? Pick one: A) 7a.m. B) 8a.m. C) 9a.m. D) 9.30a.m. E) 10a.m.
Suppose they meet x hours after 6 a.m.   Distance moved by first train in x hours + distance moved by 2nd train in x-1 hrs = 125   50x+25(x-1) = 125   x = 2hr   So they meet 2hr after 6a.m. is at 8a.m.   Answer is 8a.m.
<result>B</result>
A and B are two stations 125km apart. A train starts from A at 6a.m. and travels towards B at 50kmph. Another train starts from B at 7a.m. and travels towards A at 25kmph. At what time do they meet?