exam Maths Puzzle Numerical Ability

With Current, a motorboat travels 60 mi in 3 h. Against the current, it takes 2h longer to travel 60 mi. Find the rate of the current.

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exam Other Question

Simplify

square root of -16 - the square root of 3 times the square root of 3 - the square root of -4 times the square root of -4 + 3i - 3i^2 + 3i^3 Find a value for k so that 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n