1 gallon = 160 ounces

Cancel out common unit gallon

1 hour = 60 minutes

1 minute = 60 seconds

So 1 hour = 60 × 60 seconds

1 hour = 3600 seconds

Replace hour with 3600 seconds

Simplify  

= 0.044 ounces per second

= 0.04 ounces per second