The maximum speed that a vessel will achieve relative to ground is its own maximum speed through water plus the speed of the the moving water downstream.
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A fisherman travels downstream at full speed to his favorite fishing spot. The stream is running at a rate of 5 miles per hour, and the trip takes 2 hours to get to the fishing hole. He is surprised, however, to find that the trip takes 6 hours at full speed to get back to the dock when he is finished. How fast will his fishing boat go? the boat is going 30 mph.
24m/0.5s = 48m/s
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Circumference is diameter times Pi, you do the math.
The Minute hand makes a full circle of the clock's dial every Hour. Since there are 24 hours in a day, then the Minute hand travels 24 full circles every day.