Final answer:
The airplane is flying at a speed of 0.15 m/s.
Step-by-step explanation:
The equation given, d = 0.15t, relates the distance traveled by an airplane in miles, d, to the time in seconds, t.
To determine the speed of the airplane, we need to find the derivative of the distance with respect to time.
Taking the derivative of d with respect to t, we get:
Speed = d/dt (0.15t)
= 0.15 m/s
Therefore, the airplane is flying at a speed of 0.15 m/s.