exam Maths Puzzle Numerical Ability

A paddle boat can move at a speed of 12 km/h in still water. The boat is paddled 6 km downstream in a river in the same time it takes to go 3 km upstream. What is the speed of the river?

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Use the compund interest formulas
Find the accumulated value of an investment of $8000 at 9% compounded continuously for 4 years.
$11,466.64
$11,566.64
$10,880.00
$11,292.65 Let x = log(10,2) and y = log(10,3) Then find the coefficients a and b which satisfy log(10,3888)=a x +b y.

I am lost.