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Maths B. I can everything EXCEPT this fucking one. Please help. Show previous comments 23 more

AAAAAAAHHHHHHHHH!!!!! 1a is impossible to show!
When i take all the units as centimetre cube, the answer is : [3(pi)(x^3)]/64] {ALMOST the same}
But in metre cube, the answer i get is basically the same as the above, but 64 becomes 6400(or something like that). I'm not sure if it's a printing mistake either.
This question is apparently from the Pure Mathematics O' Level question paper of June 1992 :/ 
Head scratched, help needed.
How in the world am I supposed to use t to form the formula of h? I tried to do a test by using differentiation eg dV/dt x dh/dV to form dh/dV then integrating it to form an equation of h using t (I'm pretty sure I'm on the wrong track here), but the answer i get is like h=(2t/33.3pi) heh.
Anyone know how to solve this?