Apparently for this were supposed to use like 1/r times t or something and I really dont understand it. Iâve been trying for hours. Apparently the answer is 21 hours so if anyone could help thatâd be great
8. One pump can empty the town swimming pool in 7 hours less time than a smaller second pump can. Together they can empty the pool in 12 hours. How much time would it take the larger pump alone to empty it? 7
