10r........9h
15r.........x sunt ip
x=10*9/15=2*3/3=2h
10r......9h
r.........y sunt ip
y=10*9=90h
r...........90h......1(umple intreg bazinul)
r............45h.......z avem acelasi coeficient r deci marimile sunt dp
z=45*1/90=1/2=0,5 adica umple jumatate de bazin in 45h