exam Maths Puzzle Numerical Ability

A tour-bus goes 90 miles to its destination. The rate returning is twice as fast as going. The time for a round trip is 3 hours. How fast does the tour-bus go on each part of the trip?

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exam Other Question

The formula A=6V^2/3 gives the surface area of a cude in terms on its colume V. What is the volume of a cube with surface area of 12 square feet?

I come up with, 12=6(1)^2/3 So the colume is 1.
Am I correct? 2) Following through on your understanding of a logarithm being an exponent,

what would log b(ba) equal?

and

what would 10 log(x) equal?