very good paper airplains!

I have conducted a science experiment to see how far 2 paper airplaines could fly.
The information for plane 1 is as followes:

trile 1-
time– 1.9 seconds
distance– 12 ft. 9 in.
trile 2-
time– 2 seconds
distance– 3 ft. half an inch
average spead: (how many feat this travled in 1 second)
9.45

Airplain 2 details are as follows:
trile 1-
time– 2.2 seconds
distance– 15 feat 9 inches
trile 2-
time– 2.6 seconds
distance– 17 ft. 9 in
average spead (feat in seconds)
19.4

total average of both plains combined (spead in seconds
27.95