A reconnaissance plane flies 619 km away from its base at 500 m/s, then flies back to its base
at 750 m/s.
What is its average speed?
Answer in units of m/s.

Plss anybody know how to do this? ? i need the answers from a through d

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

The slope of a velocity time graph over any interval of time gives the during that interval