exam Maths Puzzle Numerical Ability

Two cars leave a gas station travling in opposite directions. One car travels at 60 mph and the other at 64 mph. In how many hours will they be 310 miles apart?

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1)A semiconductor manufacturer seeks to maximize its profits. Testing indicates that they can produce 100,000 chips per week at a cost of $40 per chip, and sell them for $65 per c how do you graph y=3/4x+2