exam Maths Puzzle Numerical Ability

Tom can do a job in 3 hours, Dick in 4 hours, and Harry in 6 hours. If they do it together (and do not delay each other), how long does the job take?

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exam Other Question

lorenzo bought several pounds of chocolate-covered peanuts and gave the cashier a $20 bill. Write and expression for the amount of change he will recive if p represents the costs of the peanuts. I need the number of complex roots (a chart of real and imaginary) and all of the zeros using the Rational Root Theorem (p/q) of

2x^4 - 5x^3 + 53x^2 - 125x + 75 = 0