SOLUTION: Car A and car B are travelling at 7 kph and 21 kph, respectively. If they are travelling on perpendicular roads, after how many hours will they be 75 kilometers apart?

Question 933050: Car A and car B are travelling at 7 kph and 21 kph, respectively. If they are travelling on perpendicular roads, after how many hours will they be 75 kilometers apart?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Car A and car B are travelling at 7 kph and 21 kph, respectively. If they are travelling on perpendicular roads, after how many hours will they be 75 kilometers apart?
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Car A distance for x hrs:: 7x
Car B distance for x hrs:: 21x
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Equation:
(7x)^2 + (21x)^2 = 75^2
(49 + 441)x^2 = 5625
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490x^2 = 5625
x^2 = 11.48
x = 3.39 hrs
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Cheers,
Stan H.
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