Answer
$42411.5$ feet per minute
Work Step by Step
Since, $ s= r \theta $
The linear speed for the tip of the propeller is given by: $ 2 \pi r \times 2250$
or, $2 \pi r \times 2250=6\pi \times 2250$
Thus, we have (in feet per minute)
$=2250 \times 6 \times 3.142 =42411.5$ feet per minute
