Question 115106
Unless something is horribly wrong, the end of a propeller blade travels in a circle.  If the blade is 5.5 feet long, presumably measured from the center of the propeller dome, then the circle described by the end of the blade has a radius of 5.5 feet.  Therefore, the circumference of the circle is given by {{{C=2*pi*5.5=11*pi}}} feet.


Since the propeller is rotating at 2400 rpm, the tip of the blade is travelling {{{11*pi*2400}}} feet per minute or {{{26400*pi}}} feet per minute, which is to say {{{440*pi}}} feet per second or {{{300*pi}}} miles per hour.


Since the problem did not say to compute to some nearest decimal place accuracy, I left the answers in their exact form.