A reconnaissance plane flies 425 km away from its base at 212 km/h, then flies back to its base at 305 km/h. What is its average speed?

______ km/h

Distance S=425 km

initial or first velocity u=212km/h

final or second velocity v= 305km/h

Average speed =?

Average speed=total distance/total time

or

Average speed=2uv/(u+v)

=2*212*305/(212+305)

=129320/517

=250.135km/h

~=250km/h

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