Question 1019744
Two cyclists leave from an intersection at the same time. One travels due north at a speed of 18 mph, and the other travels due east at a speed of 24 mph. How long until the distance between them is 90 miles?
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It's a right triangle, and the distance between is the hypotenuse.
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(18t)^2 + (24t)^2 = 90^2
900t^2 = 8100
t = 3 hours