exam Maths Puzzle Numerical Ability

(3st)2nd power u-4power,divided by s-1 power t 2power u 7power

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exam Other Question

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? Factor completely. If it is prime, say so.

x^3-216