Ann can skate 6 miles an hour. Her friend Glenda can skate 8 miles an hour. If they start in the same place and skate in straight lines in opposite directions for 3 hours, how many miles apart do they end up?
First find how far Glenda goes in 3 hours by multiplying her speed by the number of hours she travels: 3 hours * 8 miles/hour = 
<gadget id="calculator">3*8</gadget>
<output>24</output>
24 miles.
Then do the same thing for Ann: 3 hours * 6 miles/hour = 
<gadget id="calculator">3*6</gadget>
<output>18</output>
18 miles.
Now add the number of miles both people skated to find the total distance between them: 18 miles + 24 miles = 
<gadget id="calculator">18+24</gadget>
<output>42</output>
42 miles.

<result>42</result>