exam Maths Puzzle Numerical Ability

Decide wheter the data show inverse variation, if they do, find the missing value

x 0.3,-0.5.?,-1
y 10,-6,0.25,-6

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Please help:

Type using only positive exponents:

36x^-4 y^2 z^0 / 5x^2 y^-3 z^-2

Thanks... Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream.

*note* I really would like some help as to how to setup this question. Thank you!