Question 883879
(7 miles)/(50 minutes) = (x miles)/(75 minutes)



7/50 = x/75



7*75 = 50*x



525 = 50*x



525/50 = x



10.5 = x



x = 10.5



He runs <font color="red">10.5 miles</font> in 75 minutes (assuming his speed is the same).