Proportionately, if Jana biked at 16 miles per hour, in the first 15 minutes, he biked 4 miles.
How the distance is computed:
We can use proportions or ratio relationships to compute the distance Jana covered in the first 15 minutes, if she biked 16 miles per hour.
Jana's biking speed = 16 miles per hour
1 hour = 60 minutes
The distance covered in the first 15 minutes = 4 miles (16/60 x 15)
Thus, we can conclude that she biked 4 miles in the first 15 minutes, given her biking speed.