Answer:
I take it you mean the average gallons lost an hour, in which case you would do 58,432.4 - 56,475.2 to get 1,597.2 to which you divide by 2 getting your final answer of 978.6
The boat travels 20m in 18 sec. it has an average velocity of 20/18 m/s = +1.11 m/s
The chances would be 1/5 because you already had landed on 6
