Hi Alice, we need to calculate the rate per second for each by dividing gallons / seconds
Kitchen: 0.5 gallons in 10 seconds = 0.05 gallons in 1 second...(0.5 gallons / 10 seconds = 0.05 gallons / second)
Bathroom: 0.75 gallons in 18 seconds = 0.042 gallons in 1 second...(0.75 gallons / 18 seconds = 0.042 gallons / second)
So the kitchen sink fills faster