Answer:
Option C and D are equivalent to the speed of the model plane
Step-by-step explanation:
Distance = 330 feet
Time = 15 seconds
Speed of airplane = 
Convert it into miles per hour
1 feet = 0.000189394 miles
3600 seconds = 1 hour
So, 1 second = 
Speed of airplane in miles /hr = 
Speed of airplane in miles /hr = 
So, Speed of airplane in miles /hr is 15 miles per hour
Convert speed into feet per minute
60 seconds = 1 minute

Speed of airplane in feet / minutes = 
Speed of airplane in feet / minutes = 1320 ft/min
So, Option C and D are equivalent to the speed of the model plane