a) Mach 0.755
b) Mach 0.855
c) Mach 0.655
d) Mach 0.955
Answer: b
Explanation: The 747 has a cruise speed of up to Mach 0.855, on different versions of the 747-400. The 747-400 was offered in various configurations like passenger, freighter, combi, domestic, extended range passenger and extended range freighter versions.
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