exam Maths Puzzle Numerical Ability

i need help with simplifying expressions

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exam Other Question

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Evaluate: xy + yz + xyz

if x = 1/3

y = 24

and z = 1/8.

Thanks from Precious With a certain tail wind a jet air craft arrives at its destination 1,890 miles away in 3 hours. Flying against the same wind, the plane makes the return trip in 3 3/8 hours. Find the windspeed and airspeed.