exam Maths Puzzle Numerical Ability

what is the simplest form of (x^-2y^-3)over (x^2y^-1)^3

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exam Other Question

Five fair coins are tossed. Find the probability of obtaining 4 heads and
1 tail. During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?