Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is-

Question: Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is-

Solution:
প্রতি মিনিটে খালি হয় = (1/20 + 1/24 - 1/15)
= (11 - 8)/120
= 3/120
= 1/40

ট্যাংকের ক্ষমতা = (3 × 40) gallons
= 120 gallons