Fuel Questions response
Distance = 924 Nautical Miles
Speed = 1260kts (kts = Nautical Miles per hour)
Fuel Burn = 210Kgs per hr
Without Calculator
You are travelling at 1260kts. You cover 1260 NM in an Hour
924NM is approximately ¾ of 1260NM, or 75% = 45mins
45mins or 75% of 210Kgs (which you burn an HOUR) = 157.5kgs
With Calculator
924/1260 X 60 = 43.99998 mins (or 44 mins)
210/60 x 44 = 154Kgs
If you crosscheck with your approximation of 75% equalling 924NM, you will realise 75% is actually just over 924NM, i.e. 1260/4 x 3 = 945NM (as opposed to 924NM). I would simply deduct 1 minute from 45mins to give me 44mins and run the sums. You would get 154Kgs Fuel Burn.