The Speed of Sound is not a fixed constant, and varies at different air temperatures. However, it is commonly accepted that the general speed of sound is 1 234.8 kilometers per hour (767 miles per hour), which means about 1 mile in five seconds. This is only true when dry air is at 20 degrees Celsius (68 degrees Fahrenheit).
When an aircraft reaches the speed of sound, a vapor cone forms around the fuselage and a sonic boom is heard. Some planes can even achieve over Mach 3, such as the SR-71 Blackbird.
First of all, the AMRAAM has a built-in Inertial Navigation System (INS). It uses this to fly an interception course to the target with information usually from the launching aircraft. It can also be obtained from a data link from another fighter aircraft, or a Airborne Warning and Control System (AWACS) aircraft.
When the firing aircraft, AWACS, or another fighter aircraft continues to track the target, periodic updates are sent to the missile that consists of any changes in the target's heading and speed. This way, the AMRAAM would be able to keep the target in its radar seeker's field of view, or basket. However, not all operators have purchased this mid-course update option which might have negative effects on the AMRAAM's effectiveness in some scenarios. In fact, the RAF, which was testing the AMRAAM without the mid-course update for its Tornado F3 force, discovered that its is even less effective than the older semi-active radar homing BAE Skyflash missile.
The only time when the AMRAAM is truly a fire-and-forget weapon is when its fired at close range, which is assumed to be visual range, to the target. At that distance, the AMRAAM's own active radar seeker is automatically turned on and it will start guiding itself to the target. When the active radar seeker is turned on, the North Atlantic Treaty Organization (NATO) brevity code "PITBULL" would be called on the radio, just like when "FOXTHREE" is used to announce the launch of an AIM-120.