Based on the distance that the boat can go on 7 gallons, the gallons it would need for 78 miles is 12.13 gallons.
First step is to find the number of miles the boat can go on one gallon:
= Number of miles / Number of gallons
= 45 / 7
= 6.42857 miles
If it has to go 78 miles, the gallons needed is:
= Number of miles / Number of gallons per mile
= 78 / 6.42857
= 12.13 gallons
In conclusion, the boat would need 12.13 gallons.
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