Question

A man motors from A to B. A large part of
the distance is uphill and he gets a mileage of
only 10 miles per gallon of gasoline. On the
return trip, he makes 15 miles per gallon, then
the average of his mileage (assuming that the
distance from A to B is 60 miles) is
1) 12 2) 11 3) 10 4) 20​

Answer 1

correct answer is d) 20