Cruising speeds - 727, 737, 767, 747

Date:         17 May 97 15:15:52 
From:         Tom Atkinson <tom@tyco.net.au>
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Hello all,

Please could somebody enlighten me as to the crusing speeds of these
aircraft:

727 (200)
737 (300 or 400)
767
747 (200, 300 or 400)

By "cruising speed", I probably really mean "typical groundspeed",
assuming the aircraft is operating at its most preferred altitude, in
"nil winds".

Does sector length have much bearing on their speeds?

Does a sector of 1,700 nautical miles pose a challenge to the 737?  If
so, does it cope by going slower?

Do they all cruise at the same speed?

If they cruise at different speeds, is it because they cruise at
different altitudes?

How did the 707 compare?

Thanking you muchly in advance,
Tom Atkinson, Perth, Australia