algebra
posted by brian .
train A and B are traveling in the same direction on parallel tracks. train A is going 80 miles per hour train B is going 84 miles per hour. train A past a station at 2:15 am train B passes at 2:45 am what time will train B catch train A

In order to catchup, train B must travel the same distance; but its' time must be 1/2 hour less:
Train A time = t hrs,
Train B time = (t  0.5) hrs.
d2 = d1,
84(t  0.5) = 80t,
84t  42 = 80t,
84t  80t = 42,
4t = 42,
t = 42/4 = 10.5 hrs,
(t  0.5) = 10.5  0.5 =10h to catchup.
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