Bill is trying to dig a well in his backyard. He can dig 4 feet/hour through soil and half that fast through clay. If he has to dig through 24 feet of soil and 8 feet of clay, how long will it take him to dig the well?
First find how fast Bill can dig through clay: 4 feet/hour / 2 = 
<gadget id="calculator">4/2</gadget>
<output>2</output>
2 feet/hour.
Then find how long he spends digging through clay in total: 8 feet / 2 feet/hour = 
<gadget id="calculator">8/2</gadget>
<output>4</output>
4 hours.
Then find how long he spends digging through soil in total: 24 feet / 4 feet/hour = 
<gadget id="calculator">24/4</gadget>
<output>6</output>
6 hours.
Then add the time he spends digging through soil and clay to find the total digging time: 4 hours + 6 hours = 
<gadget id="calculator">4+6</gadget>
<output>10</output>
10 hours.

<result>10</result>