Grayson drives a motorboat for 1 hour at 25 mph and then 0.5 hours for 20 mph. Rudy rows in his rowboat for 3 hours at 10 mph. How much farther, in miles, does Grayson go in his motorboat compared to Rudy?
Grayson first travels 1 * 25 = 
<gadget id="calculator">1*25</gadget>
<output>25</output>
25 miles.
Then Grayson travels 0.5 * 20 = 
<gadget id="calculator">0.5*20</gadget>
<output>10</output>
10 miles.
Grayson travels a total of 25 + 10 = 
<gadget id="calculator">25+10</gadget>
<output>35</output>
35 miles.
Rudy travels 3 * 10 = 
<gadget id="calculator">3*10</gadget>
<output>30</output>
30 miles.
Grayson travels 35 - 30 = 
<gadget id="calculator">35-30</gadget>
<output>5</output>
5 miles more than Rudy.

<result>5</result>