Areconnaissance plane flies 605 km away from
its base at 284 m/s, then flies back to its base
at 426 m/s.
what is its average speed?
answer in units of m/s.

                      355 m/s  

Explanation:

Distance = 605 km

Initial speed = = 284 m/s

Final velocity = = 426 m/s

Average speed = ?

There is two method two find average speed. In first method, using 3rd equation of motion, we find acceleration.

Then using first equation of motion, we find time

Then using the formula of average velocity, we find average velocity

Second method is very simple

                                   355 m/s      

b.transmitters send radio waves, and receivers capture radio waves.

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.