It takes a boat 2 hours to travel 24 miles downstream and 3 hours to travel 18 miles upstream (a)What is the speed of the boat in still water? (b) What is the speed of the river?
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It takes a boat 2 hours to travel 24 miles downstream and 3 hours to travel 18 miles upstream
(a)What is the speed of the boat in still water?
(b) What is the speed of the river?
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- A boat travels 12km downstream and 16km upstream in 12 hours. If the rate of the current is 3kph, what is the rate of boat in still water?It takes 4 hours for a boater to travel 15 miles upstream and back. If the speed of the boat in still water is 8 mph, what is the speed of the current? Sally can clean the house in 8 hours, her father can clean the house in 6 hours, and her younger brother, Dennis, can completely mess up the house in 10 hours. If Sally and her father clean and Dennis plays, how long will it take to clean the house?It took a crew 1h 12min to row 1km upstream and back again. If the rate of flow of the stream was 2km/h, what was the rowing speed of the crew in still water?
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- You swim at a speed 2km/h south west and a river is flowing at 1km/h south Please draw a diagram of this situation and calculate the speed the person is swimming atThe displacement from point B to point C is m.The displacement from point C to point D is m.The displacement from point D to point E is m.When salmon head upstream to spawn, they may encounter a waterfall. If the water is not moving too fast, the salmon can swim right up through the falling water. Otherwise, the salmon jump out of the water to get to a place in the waterfall where the water is not falling so fast. When humans build dams that interrupt the usual route followed by the salmon, artificial fish ladders must be built. The consist of a series of small waterfalls with still pools of water in between them. Suppose the salmon can swim at 5.40 m/s with espect to the water. What is the maximum height of the waterfall up which the salmon can swim without having to jump? If a waterfall is 1.90 m high, how high must the salmon jump to get to water through which it can swim? Assume that they jump straight up. What initial speed must a salmon have to jump the height to get to water through which it can swim? For a 1.00-m high waterfall, how fast will the salmon be swimming with respect to the ground when it starts…