I flew my tiny seaplane to visit my mother. On the flight up, I flew at 110 mph. On the way home, I flew 90 mph. What was my average speed for the trip? Choose the correct option:	A) 198 mph	B) 110 mph	C) 88 mph	D) 100 mph	E) 99 mph
(110 mph +90 mph)/2= 100 mph   Correct answer is: 100 mph
<result>D</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 90 mph. What was my average speed for the trip?