exam Maths Puzzle Numerical Ability

It takes one boy 30 minutes to deliver his newspapers. It takes another boy 20 minutes to do the same route. How long would it take them to deliver the newspapers if they worked together?

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exam Other Question

2log(x) - log(x^2) + log(2/x) + log(x)

I tried to simplify as far as I could and came to:

log2 (x) + log(x)

I just want to know if this is the correct answer? If so, can it be simplified anymore? The number -12.6 or in fraction form negative 63 over 5 is between two consecutive odd integers. What is the product of these two integers?