Wind correction for descent distance ?
The MGR Rules of Thumb say:
20) Top of Descent (Idle thrust - 3° descent path)
TOD (NM) = ∆ FL/3
FL 280 down to 2000 feet
TOD = 260 / 3 = 87 NM
25) Wind correction for descent distance
Wind Corr (NM) = 10% for each 40 kt component
Example Thumbrule 20) with 20 kts Tailwind
Add 58 to 87 = 92 NM (here it is a mistake?)