exam Maths Puzzle Numerical Ability

Could I please get assistance with the following problem:

The product of:

2 1 and 3 1 -1
-3 5 and 2 4 -2 is what

both group of nu

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exam Other Question

The moon is approximately a sphere with radius 1080 miles?
Estimate the surface area of the moon to the nearest million square miles and also the surface area of the earth is how Mark can overhaul an engine in 20 hours and Phil can do the same job by himself in 30 hours. If they both work together for a time and then Mark finishes the job by himslef in 5 hours. How long did they work together?