You travel 31 NM. How much fuel will you need if you burn 6 kgs per minute, and are travelling at 62 kts?
In this case we need to work out the time it takes to travel 31 NM if you're travelling at 62 kts. 31/62 = 1/2 Therefore 1/2 x 60 = 30 minutes.
The amount of fuel burned is 30 x 6 = 180 kg of fuel.