You have steamed 775 miles at 17 knots, and consumed 145 tons of fuel. If you have to steam 977 miles to complete the voyage, how many tons of fuel will be consumed while steaming at 18 knots?
• Fuel consumption is usually related to time in hours, not just distance • To compare two steaming conditions, first find the consumption rate per hour from the known condition • Use the basic speed formula: Speed = Distance / Time to find steaming time for each leg
• How many hours did it take to steam the first 775 miles at 17 knots, and how many tons of fuel were burned per hour? • Once you know tons per hour, how many hours will it take to steam 977 miles at 18 knots? • After you get total tons for the second leg, compare your result to the choices and consider rounding/decimal effects.
• Be sure you convert miles and knots correctly: Time (hours) = Distance (NM) / Speed (knots) • Double-check that you are using tons per hour, not tons per mile • After computing, see if your answer is reasonable compared to the first leg (is it more or less fuel, and does that make sense with speed and distance?)
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