Answer:
473.8miles/hr
Step-by-step explanation:
Given parameters: 
Time of flight = 4hrs 
Distance traveled = 1895miles 
Unknown: 
Speed of the plane = ? 
Solution: 
Speed is the rate of distance covered per unit of time. 
It is expressed as: 
 Speed = 
 
 
So; 
 Speed = 
 = 473.8miles/hr
 = 473.8miles/hr