At 0715, on March 9, you pass Knox Landing Gage at mile 313.8 (AHP) and estimate the current will average 3.5 mph for the remainder of the time on the Mississippi River. What is your ETA at the mouth of the Ohio River if you increase speed to turn for 10 mph?
• Using river miles (AHP) to find the distance between two points on the Mississippi • Computing speed made good (SMG) when running with the current • Converting time in decimal hours to hours and minutes, then adding to a starting date and time
• What river mile is the mouth of the Ohio River listed at in your reference, and how far is that from mile 313.8 AHP? • If your vessel is making 10 mph through the water and the current is helping you at 3.5 mph, what is your actual speed over the ground downstream? • Once you know the distance and your speed over the ground, how many hours will the trip take, and what calendar date and clock time does that give you when added to 0715 on March 9?
• Be sure you are using the correct river mile for the Ohio River mouth (Mississippi River mile, not Ohio River mile). • Double‑check that you add the current to your vessel speed (you are going downstream, not upstream). • After you find the travel time, carefully convert decimal hours to hours and minutes and then add to both the time of day and the calendar date before matching an answer choice.
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