The inlet pipe can fill the empty swimming pool in 8 hours, while the outlet pipe can empty the pool from full capacity in 12 hours. if both pipes are opened when the tank is 25% full, how many hours from there does it take for the tank to fill to 90% capacity ?
I am getting 16.2hrs, but that's not the answer. don't know what am I missing... SOS
3.12 hours, right?