8.Three pumps, X, Y. and 2, working simultaneously at their respective constant rates. can ll a tank in 5 hours. Pumps X and Y, working simultaneously at their respective constant rates. can ll the tank in 7 hours. How many hours will it take pump 2. working alone at its constant rate, to ll the tank? 1" 1.7 10 15 17.5 30 9.If the diameter of circle X is 3 times the diameter of circle Y, then the area of circle X is how many times the area of circle Y? * O 3 O 6 0 9 O 12 O 8