The first one is fairly easy. The problem says " The cost of fuel to propel a boat through the water (in dollars per hour) is proportional to the cube of the speed v.". Letting "C" be the cost of fuel in dollars per hour and "v" the speed in miles per hour, then (that's what "proportional"means).

Since you are also told "A certain ferry boat uses $196 worth of fuel per hour when cruising at 10 miles per hour", put C= 196 and v= 10 in that equation and solve for k.

Going at speed "v miles per hour", it will take, of course, 1/v hours to go one mile. Since the cost of fuel is dollars per hour, the fuel cost to go 1 mile is dollars. Since the cost of everything else is 1323 dollars per hour, that cost, to go one mile, will be 1323/v dollars. The total cost will be the sum of those: