SOLUTION: An Amtrak train leaves Penn Station, NYC, traveling south at 60mph. Three hours later, a Metroliner leaves the same station traveling south at 80mph. How long will it take the Metr

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Question 250355: An Amtrak train leaves Penn Station, NYC, traveling south at 60mph. Three hours later, a Metroliner leaves the same station traveling south at 80mph. How long will it take the Metroliner to catch up to the Amtrak train.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
D=RT
D=60T
D=80(T-3)
SET THE 2 DISTANCES EQUAL.
60T=80(T-3)
60T=80T-240
60T-80T=-240
-20T=-240
T=-240/-20
T=12 HOURS THEY WILL MEET.
PROOF:
60*12=80(12-3)
720=80*9
720=720