SOLUTION: Andrea left the study group traveling 16 mph. Then, 3 hours later, Holly left traveling the same direction at 28 mph. How long until Holly catches up with Andrea?

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Question 1046977: Andrea left the study group traveling 16 mph. Then, 3 hours later, Holly left traveling the same direction at 28 mph. How long until Holly catches up with Andrea?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
D = rt
Distance the same for both Holly and Andrea
16t = 28(t-3)
84 = 12t
7 = t, Andrea's time. Holly catches up in 4 hours 7+-+3
AND
16*7 = 28*4 = 112mi CHECKS!