Velocity With the Wind = 700/3.5 = 200 mph
Velocity Against the Wind = 700/5 = 140 mph
Taking the average we get:
Airplane Velocity In Still Air = 170 mph
Wind Velocity = 30 mph
Source:
http://www.1728.org/veloccal.htm
Z = -5. This sentence is used to make up for the extra characters needed.
Move the decimal to the right 4 places to get 4 x 10^-4 which reads four times ten to the negative fourth power