exam Maths Puzzle Numerical Ability

It takes Bob three hours to mow a lawn, and John can mow the same lawn in 2 hours. How long would it take the two of them working together to mow that lawn?

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exam Other Question

write as a fraction,reduce. 0.45(repeater bar over the 5) Find the determinant.

4 -4 10
-1 1 -2
-2 -4 -3