Tim rides his bike back and forth to work for each of his 5 workdays.  His work is 20 miles away.  He also goes for a weekend bike ride of 200 miles.    If he can bike at 25 mph how much time does he spend biking a week?
He bikes 20*2=
<gadget id="calculator">20*2</gadget>
<output>40</output>
40 miles each day for work.
So he bikes 40*5=
<gadget id="calculator">40*5</gadget>
<output>200</output>
200 miles for work.
That means he bikes a total of 200+200=
<gadget id="calculator">200+200</gadget>
<output>400</output>
400 miles for work.
So he bikes a total of 400/25=
<gadget id="calculator">400/25</gadget>
<output>16</output>
16 hours.

<result>16</result>