At what constant engine speed did the boat travel if the river’s current is a constant 4 mph?
A boat travels 10.5 miles downriver in an hour less than it take for it to travel 10.5 miles upriver. At what constant engine speed did the boat travel if the river’s current is a constant 4 mph?
Insufficient information. What force does the propeller provide? We can figure the speed relative to the current, but the engine speed depends on the force of the prop, assuming 1:1 power transmission, I.e., no reduction gearing, which most boats have, and what RPM the engine needs to run at to give that force..
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