On a trip, a cyclist averaged 8 miles per hour for the first 16 miles and 10 miles per hour for the remaining 16 miles. If the cyclist returned immediately via the same route and took a total of 6.8 hours for the round trip, what was the average speed (in miles per hour) for the return trip?	Choose the most appropriate option.
A) 9  B) 10  C) 11  D) 12  E) 13
The time to go 32 miles was 16/8+16/10=2+1.6= 
<gadget id="calculator">2+1.6</gadget>
<output>3.6</output>
3.6 hours.   The average speed for the return trip was 32 miles/3.2 hours= 10 mph.   The answer is 10.
<result>B</result>
On a trip, a cyclist averaged 8 miles per hour for the first 16 miles and 10 miles per hour for the remaining 16 miles. If the cyclist returned immediately via the same route and took a total of 6.8 hours for the round trip, what was the average speed (in miles per hour) for the return trip?