exam Maths Puzzle Numerical Ability

how do i Simplify by rationalizing the denominator: 5 times square-root of 6 divided by negetive square-root of 3.

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exam Other Question

an airplane made a 2040-kilometer trip in the direction of the wind in 5 hours last tuesday. if the trip against the direction of the wind took an hour longer, find the rate of the plane in still air and the velocity of the wind. Helped by a strong jet stream, a Los Angeles-to-Boston plane flew 10% faster than usual and made the 4400km trip in 30 min. less time than usual. At what speed does the plane usually fly?