Answer:
304.13 mph
Step-by-step explanation:
Data provided in the question :
The Speed of the flying aircraft = 300 mph
Tailwind of the true airspeed = 50 mph
Now,
The ground speed will be calculated as:
ground speed =

or
The ground speed =

or
The ground speed = 304.13 mph
Hence, the ground speed is 304.13 mph