There is a sign posted 10mph speed limit on the train bridge.
10 knots against a 7 knot current would barely be headway. But 10 mph against a 7 knot current would almost appear to someone on shore as a boat doing 17 mph as judged by its wake.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn.
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