Question 128132
Here by the data that is given - 


Distance = 28 miles 


time taken is 30 mins 


Let us convert the time in minutes to hours

1 hr = 60 mins

x hr = 30 mins


==> x = 1/2 hr 


==> x = 0.5 hr


We have to calculate the speed.


Speed = Distance traveled / time taken



Speed = 28/0.5  


Speed = 56 miles/hour