Answer:
avg speed =total distance/total time
total distance =2km (given)
total time=1/10 +1/25=7/50
so avg speed =100/7=14.28
First let's convert everything into SI units.
The length of the blade is 3 inches. Keeping in mind that 1 inc=0.025 m, we have

The angular speed is 600 revolutions per minute. Keeping in mind that

and

, the angular speed becomes

And so, the linear velocity of the edge of the blade is equal to
No one answeres physic questions, iveneeded help all morning
<span>Radio Waves, Microwaves, infra-Red, Visible spectrum, Ultraviolet radiation, x-rays, Gamma Rays. Then again I could be wrong.</span>