Looking for trustworthy answers? Westonci.ca is the ultimate Q&A platform where experts share their knowledge on various topics. Experience the convenience of finding accurate answers to your questions from knowledgeable experts on our platform. Connect with a community of professionals ready to help you find accurate solutions to your questions quickly and efficiently.

A pump can fill a pool in 9 hours. After 5 hours another pump is brought in. This pump, by itself, can fill the pool in 3 hours. How much longer (in hours) will it take for both pumps, working together, to fill the pool?