Question

For a certain bathtub, the cold water faucet can fill the tub in 8 minutes. The hot water faucet can fill the tub in 12 minutes. If both faucets are used together, how long will it take to fill the tub?

Answer 1

Explanation:

Rate 1 = 1 tub / 8 min

rate 2 = 1 tub / 12 min

Now add the rates together for 1 tub

1 tub / ( 1/8 + 1/12 tub/min) ) = 4.8 min to fill tub with both