Refer to figures.

Convert CAS into TAS (CRP5 method):

(1) In the "Airspeed" window, align 5 500 ft with OAT = +10°C;
(2) On the inner arc, look for CAS 140 kt and read a result of approximately 154 kt TAS.

Calculate the Ground Speed:

Ground Speed = Distance / Time
Ground Speed = 25 NM / 8 min = approx. 188 kt

Determine Drift:

There is a 10° difference between the track and the heading, which means that drift = 10°. Track is lower than heading, meaning it's a left drift (10°L).

Determine W/V (CRP5 method):

1. Set Magnetic Heading (005°M) under "True Index"
2. Place centre dot over TAS (154 kts)
3. Mark the point where drift (10°L) and GS (188 kt) meet.
4. Rotate the wind computer until mark is below TAS.
5. Check wind direction under "True Index" (139°)
6. Count down from TAS to obtain wind speed (154 - 109 = 45 kt)

=> W/V = 139(°M)/45 kt