SOLUTION: Two planes flying in opposite directions left Newark at the same time. One plane was travelling 420 mph, the other at 516 mph. In how many hours will they be 4,680 miles apart?

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Question 925796: Two planes flying in opposite directions left Newark at the same time. One plane was travelling 420 mph, the other at 516 mph. In how many hours will they be 4,680 miles apart?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
D = rt
Flying in Opposite Directions..
420t + 516t = 4680
t = 4680/936 = 5hr