William left Missouri by 7:00 AM and arrived at his hometown by 8:00 PM. He had 3 stops of 25, 10 and 25 minutes respectively during the journey. How many hours did he spend on the road?
8:00 PM is equivalent to 20:00 hrs so he spent a total of 20-7 = 
<gadget id="calculator">20-7</gadget>
<output>13</output>
13 hours on the journey.
He spent 25+10+25 = 
<gadget id="calculator">25+10+25</gadget>
<output>60</output>
60 minutes on stops.
There are 60 minutes in an hour so he spent (60/60) = 
<gadget id="calculator">60/60</gadget>
<output>1</output>
1 hour on stops.
Therefore, he spent 13-1 = 
<gadget id="calculator">13-1</gadget>
<output>12</output>
12 hours on the road.

<result>12</result>