Lynch time maths

A plane travels at a speed of 400 miles per hour for 1200 miles, and then returns by the same route at a speed of 300 miles per hour. What is the average speed for the total trip?
( tfs bye, Fri 12 Jan 2007, 13:55, archived)

Don't you mean
"How big is the pilot's cock?"
( Dave Trouser ; the people's choice - 75% agree, Fri 12 Jan 2007, 13:56, archived)

9"

( tfs bye, Fri 12 Jan 2007, 13:57, archived)

NOTHING!
THE PLANE IS CANCELLED DUE TO FOG!
YOU CAN'T SEE FOR SHIT IN THE FOG!
( Edd: The Unfunny Try-Hard Edgelord, Fri 12 Jan 2007, 13:56, archived)

But where do you bury the survivors?

(Flabbergaster laughs at danger (and breaks all the rules), Fri 12 Jan 2007, 13:56, archived)

Does that include stop over time?
And I suppose if it's just distance travelled over time that'd be
0 miles travelled (because of finishing in the same place)
over however hours
So 0mph
( Dave the Mighty, Fri 12 Jan 2007, 13:56, archived)

That's the average velocity surely. Speed is scalar.
Or have I got that the wrong way around?
( The Teviot Moose major 5th., Fri 12 Jan 2007, 13:58, archived)

That sounds right. I was just assuming it was a trick question

( Dave the Mighty, Fri 12 Jan 2007, 13:58, archived)

342.86mph

( Moon Girl Technologies horrendous beanbag, Fri 12 Jan 2007, 13:57, archived)

winnar

( tfs bye, Fri 12 Jan 2007, 13:58, archived)

343MPH. Ish.
or 24/7 x 10² MPH
( The Teviot Moose major 5th., Fri 12 Jan 2007, 13:57, archived)

Close ish

( tfs bye, Fri 12 Jan 2007, 13:58, archived)

ground speed or air speed?

( sex and dougs and rock n roll, Fri 12 Jan 2007, 13:58, archived)

African or European?

( Gizmo.mp3 does not exist, Fri 12 Jan 2007, 14:00, archived)

is it an African or European plane?
EDIT: Also see above.
( Sexy Picard 2000, Fri 12 Jan 2007, 13:59, archived)

German
Wankel
( tfs bye, Fri 12 Jan 2007, 14:00, archived)