Problem Statement
Two taps can fill a tank in 20 min and 30 min. Both are opened together. After 5 min, the first tap is closed. How long in total to fill the tank?
Explanation
Use 60-unit work. Rates are 3 and 2 units per minute. First 5 min add 25 units. Remaining 35 units are filled by the second at 2 per minute, taking 17.5 min. Total is 22.5 min.
Code Solution
SolutionRead Only
Work = 25 + 2t = 60 ⇒ t = 17.5 ⇒ total 22.5
