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Question 168383: Two planes started at the same time from tow different airports that are 3,600 kilometers apart and flew toward each other. One plane flew at 792 kilometers per hour, and the other flew at 888 kilometers per hour. In how many hours were the planes still 240 kilomters apart?
Found 2 solutions by checkley77, stanbon:
Answer by checkley77(12844)   (Show Source):
You can put this solution on YOUR website! 792t+888t=3,600-240
1,680t=3,360
t=3,360/1,680
t=2 hours after takeoff they will be 240 miles apart.
Proof:
792*2+888*2=3,600-240
1,584+1,776=3,360
3,360=3,360
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Two planes started at the same time from two different airports that are 3,600 kilometers apart and flew toward each other. One plane flew at 792 kilometers per hour, and the other flew at 888 kilometers per hour. In how many hours were the planes still 240 kilomters apart?
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closing speed = 792 + 888 = 1680 kph
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Distance covered = 3600-240 = 3360 km
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Time to cover that distance = 3360/1680 = 2 hrs.
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Cheers,
Stan H.
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