Answers

2015-02-02T13:36:32+05:30
Mach number is used in connection with the speed of aircraft
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2015-02-02T13:48:18+05:30
It is used for the connection of Speed of Aircraft... 
Actuully, the Speed of Missiles or Aircraft is measured in MACH nos.

1 Mach = 768 miles / hr.
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