exam Maths Puzzle Numerical Ability

Please help me with this question: Two cars, one going north at 40 mph and one going south at 50 mph, leave town at the same time. In how many hours will they be 360 miles apart?

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exam Other Question

the formula for finding the distance between two end points that are set up like this A(6,2) B(0,-3) we are supposed to try and find the slant asemptotes for this problem. i dont understand how to do that becasue it wont work out. here is the problem.
X3-1
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x2