To find out how many laps you need to ride each day to reach a total of 140 laps over 14 days, you can divide the total number of laps by the number of days:
\[ \text{Laps per day} = \frac{\text{Total laps}}{\text{Number of days}} = \frac{140 \text{ laps}}{14 \text{ days}} = 10 \text{ laps per day} \]
So, you must ride 10 laps each day.