exam Maths Puzzle Numerical Ability

Simplify:

((x^(3/2))y^-3)^1/3
--------------------
((x^(1/2))y^-6)^-1

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exam Other Question

A mississippi riverboat can travel 30km downstream in 3 hours and make the return trip in 5 hours. Find the speed of the boat in still water. Note: This is from a worksheet not a textbook.
v2=42.2m/s
t=47.3s
a=1.34m/s2
v1=:?
You are supposed to use the acceleration formula on this [I AM PRETTY SURE]
It is a=v2-v1/t