I flew my tiny seaplane to visit my mother. On the flight up, I flew at 110 mph. On the way home, I flew 72 mph. What was my average speed for the trip?  Options: A) 198 mph B) 91 mph C) 88 mph D) 100 mph E) 99 mph
(110 mph +72 mph)/2= 91 mph   Correct answer is: 91 mph
<result>B</result>
I flew my tiny seaplane to visit my mother. On the flight up, I flew at 110 mph. On the way home, I flew 72 mph. What was my average speed for the trip?