City -> 25 miles/gallon -> 10 miles traveled -> gallons used = 10/25 = 2/5
Highway -> 40 miles/gallon -> 50 miles traveled -> gallons used = 50/40 = 5/4
Total distance traveled = 50+10 = 60 miles
Gallons used = 2/5 + 5/4 = 33/20
So, the average miles/gallon = 60/(33/20) = 60*20/33 = 400/11 ~= 36.3 ~= 36
Hence, D
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