Question

pipes a and b can fill tank in 18 and 30 mintues. pipe c can drain 120 liters of water per minute. if all three opened together the tank two -third is filled in 30 mintues find tank capacity​

Answer 1

Step-by-step explanation:

let's C be the capacity of tank

Then, in 1 min water in the tank will be

(1/18+1/30)C-120

if 2/3 of tank will fill in 30 min then, full tank will fi in 30÷(2/3)=45 min

so equation will be,

C=45(1/18+1/30)C - 45×120

C= 45(8/90)C -5400

C=4C-5400

3C=5400

C=1800 lit