Question

two taps take 5 hours and 10 hours to fill a tank. Two outlets take 15 hours and 30 hours to empty the tank . If both the taps and outlets are opened , how long will it take to fill up the tank ? ​

Answer 1

first step

15.30÷2

=7.65

1 hour has 60 mins so convert mins to hours then

8.05hour or 8 hour and 8 mins