Question 290314
Trains A and B are traveling in the same direction on parallel tracks.
 Train A is traveling at 60 mph and Train B is traveling at 70 mph.
 Train A passes a station at 7:15 p.m.
 If train B passes the same station at 7:27 p.m.
 Then at what time will train B catch up to train A?
:
from the given information, we know that train B is 12 min (1/5 hr) behind
 train A, when train A passes the station
:
The distance between the trains at this time: {{{1/5}}} * 70 = 14 mi
:
Let t = time required for train B to catch train a
:
write a distance equation: Dist = speed * time
:
Train B travel dist = Train A travel dist + 14 mi
70t = 60t + 14 
70t - 60t = 14
10t = 14
t = {{{14/10}}}
t = 1.4 hr or 1 hr 24 min
:
7:15 + 1:24 = 8:39 pm, B catches A