You have steamed 1124 miles at 21 knots, and consumed 326 tons of fuel. If you have 210 tons of usable fuel remaining, how far can you steam at 17 knots?
• Fuel consumption is usually proportional to time, not distance, for a given power setting • First, find the fuel consumption rate in tons per hour from the initial voyage data • Use that same hourly fuel consumption rate to find how long you can steam on the remaining fuel, then convert that time to distance at 17 knots
• From the initial leg, what was your steaming time in hours at 21 knots, and how many tons per hour does that work out to? • Once you know tons per hour, how many hours can you steam on 210 tons, and at 17 knots, how many miles is that? • After you compute the distance, which of the choices is closest to your calculated value when rounded properly?
• Be sure you convert miles to nautical miles correctly if needed; remember that 1 knot = 1 nautical mile per hour • Check your units at each step: hours, knots (nm/hr), tons/hour, and miles should be consistent • Recalculate the fuel rate to ensure it is reasonable (not an extreme value) before using it to find the final distance
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