Question 124932
The given data is:

Distance traveled = 750 miles and 


Time taken = 7.5 hours


Here lets find the speed of the plane.


Speed = distance traveled/ time taken 

  S = 750/7.5 

  S = 100 miles per hour 



Now we shall calculate for the rest of the data. 


Distance remains the same 750 miles 


but time taken = 3 hours 


Therfore Speed = dist/time


Speed = 750/3 


Speed = 250 miles 



Thus the solution.