A man walks from B to C, a distance of x miles, at 10 miles per hour and returns at 12 miles per hour. What is his average speed?
Choose the correct choice from the following answers:
A) 10.9 mph
B) 9.6 mph
C) 8.8 mph
D) 8.4 mph
E) 4 mph
Total distance covered = 2x   Time taken12miles / hour = x/12 hrs   Time taken @ 10 miles / hour = x/10 hrs   10.9 mphvg speed = 2x / (x/9 + x/12) = 10.9 mph   10.9 mphns is 10.9 mph
<result>A</result>
A man walks from B to C, a distance of x miles, at 10 miles per hour and returns at 12 miles per hour. What is his average speed?