Joel sailed for 3 hours at a speed of 20 miles per hour, then for 6 hours at 30 miles per hour and finally, 1 more hour at 40 miles per hour. What was the average speed of Joel during the whole sail?
.	Choose one
A) 25  B) 27.5  C) 28  D) 30  E) 32
3 hours at a speed of 20 miles per hour gives us Distance = 20*3= 
<gadget id="calculator">20*3</gadget>
<output>60</output>
60 miles   6 hours at a speed of 30 miles per hour gives us Distance= 30*6= 
<gadget id="calculator">30*6</gadget>
<output>180</output>
180 miles   1 more hour at 40 miles per hour gives us Distance= 40*1= 
<gadget id="calculator">40*1</gadget>
<output>40</output>
40 miles   Total Distance= 60+180+40= 
<gadget id="calculator">60+180+40</gadget>
<output>280</output>
280 miles   Total Time= 3+6+1= 
<gadget id="calculator">3+6+1</gadget>
<output>10</output>
10 Hours   Average Speed= 280 / 10= 
<gadget id="calculator">280 / 10</gadget>
<output>28</output>
28 Miles per hour   ANSWER:28
<result>C</result>
Joel sailed for 3 hours at a speed of 20 miles per hour, then for 6 hours at 30 miles per hour and finally, 1 more hour at 40 miles per hour. What was the average speed of Joel during the whole sail?
.