It takes 240 minutes of walking to break in a new pair of shoes. Jason wants to try out for the track team in three weeks. If he can walk 4 days a week to break in the new shoes, how long does he have to spend walking each day?
First find how many days Jason has to prepare for the tryouts: 3 weeks * 4 days/week = 
<gadget id="calculator">3*4</gadget>
<output>12</output>
12 days.
Then divide the time it takes to break the shoes in by the time Jason can spend each day to find how long he needs to walk each day: 240 minutes / 12 days = 
<gadget id="calculator">240/12</gadget>
<output>20</output>
20 minutes/day.

<result>20</result>