Posted by Leila on Monday, March 1, 2010 at 1:35am.
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 64 miles per hour. train a passes a station at 1:25 pm. if train b passes the same station at 1:55 pm, at what time will train b catch up to train a?

Algebra  Reiny, Monday, March 1, 2010 at 8:53am
Let the time from 1:55 to when they meet be t hours
so when they meet:
train a has gone 30 + 60t miles
train b has gone 64t miles
64t = 30 + 60t
t = 15/2 or 7.5 hours = 7hours, 30 minutes
so the meet at 1:55 + 7:30 = 9:25 pm
check: first train went from 1:25 to 9:25 or 8 hours
distance = 8(60) = 480 miles
second train from 1:55 to 9:25 = 7.5 hours
distance  7.5(64) = 480 miles
Yeahhh!

Algebra  danny, Monday, March 1, 2010 at 11:59am
9f + 7f  17
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