A bicyclist travels uphill from town A to town B for 2 hours at an average speed of 4 miles per hour and returns along the same road at an average speed of 5 miles per hour. What is the bicyclist’s average speed for the round trip, in miles per hour? Choose the correct choice from the following:
A) (a) 24/5 B) (b) 5 C) (c) 40/9 D) (d) 27/5 E) (e) 28/5
from the uphill we can find out the distance = 4*2= 
<gadget id="calculator">4*2</gadget>
<output>8</output>
8   average speed= total distance/total time   = 16/ (2+ (8/5)) = 40/9   Answer is (c) 40/9.
<result>C</result>
A bicyclist travels uphill from town A to town B for 2 hours at an average speed of 4 miles per hour and returns along the same road at an average speed of 5 miles per hour. What is the bicyclist’s average speed for the round trip, in miles per hour?