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Ok you have this problem

quick analysis reveals that time is independent on the density rho, so thats one down

The average velocity can be found by combining both formulas:
rho*v^2 = 2*p*g + p*g*h

Wher I say p, I mean rho ;P ... I mix em up sometimes

after we solve for v, what can we do to obtain ttime?

im stuck on the very first problem :(

Yeah I don't even understand how they could pull out those assumptions.