exam Maths Puzzle Numerical Ability

999+999=

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evaluate 7 - 2(15-2 to the 3rd power) 3 to the 2nd power - 5 (3) This is the best way I can type it.

Thanks two planes leave simultaneously from an airport, one flying east and the other west. they are 870 mi apart after 3/4 h. if the eastbound plane averages 120 mi/h more than the westbound plane, at what rate is each plane flying?