Homework Help: algebra

Posted by Rich on Sunday, December 20, 2009 at 2:38pm.

Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 60 miles per hour and train B is traveling at 80 miles per hour. Train A passes a station at 5:15 A.M. IF train B passes the same station at 5:27A.M., at what time will train B catch up to train A?

algebra - MathMate, Sunday, December 20, 2009 at 4:01pm
At 5:27 am, train B is behind train A by
(27-15)/60*60 h*mph
= 12 mi
Train B's speed exceeds that of train A by
(80-60)=20 mph.
Can you take it from here?
algebra - Damon, Sunday, December 20, 2009 at 4:04pm
A travels for time t
B travels for time (t - 12 minutes )
A goes 60 mph = 1 mile/minute
B goes 80 mph = 4/3 mile/minute
distance is the same
so
1 t = (4/3)(t-12)
3 t = 4 t - 48
t = 48 minutes
5:15 + 48 minutes = 5:63 which is 6:03

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