Answer
The speed of the SR-71 Blackbird is 2,442 miles per hour.
Work Step by Step
This problem is asking for us to find the speed $A$ given the Mach number. We can plug in the value given for $A$ into the equation $M = \frac{A}{740}$ to find the speed of this aircraft. We plug in $3.3$ for $M$:
$$3.3 = \frac{A}{740}$$
To isolate $A$, we multiply both sides of the equation by $740$ to get rid of the fraction:
$$A = (3.3)(740)$$
We now multiply to get the value for $A$:
$A = $ 2,442 miles per hour
