exam Maths Puzzle Numerical Ability

Two cars leave town going in the same direction on the same road. One travels at 30mph and the other at 46mph. In how many hours will they be 72 miles apart?

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exam Other Question

I am stuck on correct answer for:

what are all possible values of X such that X^2 = 5x

I am not using any specific book. I am just practicing.. (1/2 x to the second power y to the third power)to the fourth power