book Maths Puzzle Numerical Ability

Two mathematicains were out for a walk. In answering the question of how many children she had, one of the mathematicians replied that she had 3 children and the product of their

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3. Candy and Tim share a paper route. It takes Candy 70 minutes to deliver all the papers, whereas Tim takes 80 minutes. How long does it take them when they work together? If y = 39 and y = -x/4 + 15, what is the value of X?