24 gallons per second of water flows down a waterfall. If you have an empty basin that can hold 260 gallons of water. The basin leaks water at 4 gallons per second. how long would it take to fill the basin with water from the waterfall in seconds?
24 gallons in minus 4 gallons out is 24-4=
<gadget id="calculator">24-4</gadget>
<output>20</output>
20 gallons per second
260 gallons divided by 20 gallons per second 260/20 = 
<gadget id="calculator">260/20</gadget>
<output>13</output>
13 seconds.

<result>13</result>