exam Maths Puzzle Numerical Ability

I am so confused with these problems....

What expression raised to the fouth power is 81x (12 to the power)y (8 to the power) z (16 to the power).

All number except the 81 are exponents.

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exam Other Question

An airplane left an airport flying at at 180 mph. A jet that flies at 333 mph left 1 hour later. The jet follows tthe same route as the airplane on parallel altitudes. How many hours will it take the jet to catch up with the airplane? the question is solve each by addition if a solution don't exist state whether the system is inconsistent or dependent..

the first question-- 2x+3y=1
5x+