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How do you do to accept the contracts??

I make a mathematical expression to foresee the time expend in the travel.

The expression are below:

(Range)*(diesel use)/(diesel fuel)= speed (nm/day)

In this expression you will find the speed in "nautical miles/day" in differents percents of speed.
So, I make the list contends this information and the range:

for example:
Large Freighter
100% - 360 nm/day - 8183 nm
90% - 324 nm/day - 9511 nm
80% - 288 nm/day - 11115 nm
70% - 252 nm/day - 12827 nm
60% - 216 nm/day - 14400 nm
50% - 180 nm/day - 15553 nm

When I analyse a contract, I go to the map and see the distance between the ports. So I divide the distance for the time avaliable to finish of the contract, and compare this result with the above list, and choice the best speed to travel.


What do you think about it???
How do you do???