On a day when the speed of sound in the upper air is 320 m/s, you fly coast to coast in the United States, a distance of about 4 850 km, in about one hour, if the Mach number for the speed of your airplane is about
A) 1.
B) 2
C) 3
D) 4
E) 5.

Question

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The Answer of On a day when the speed of sound in the upper air is 320 m/s, you fly coast to coast in the United States, a distance of about 4 850 km, in about one hour, if the Mach number for the speed of your airplane is about
A) 1.
B) 2
C) 3
D) 4
E) 5.

On a Day When the Speed of Sound in the Upper