1.A person rows a boat 85 km downstream and then 45 km upstream, taking 2.5 hours for each journey. What is the speed of the current?
2.A boat travels upstream at 60 km/h and downstream at 80 km/h. Calculate the boat's speed in still water and the velocity of the current.
3.A boat travels at 60 km/h in still water, and the current flows at 20 km/h. What are the boat's speeds when moving downstream and upstream?
4.A stream flows at a speed of 1 km/h. A motorboat travels 35 km upstream and then returns to the starting point, taking a total of 12 hours. What is the speed of the motorboat in still water?
5.A man rows a boat at 4.5 km/h in still water. He travels upstream against a river current flowing at 1.5 km/h to a certain point and then returns downstream to his starting position. What is his average speed for the entire trip?
6.A stream flows at 4 km/h. A boat travels 6 km downstream and then returns 6 km upstream, completing the round trip in 2 hours. What is the boat's speed in still water?
7.A man rows at a speed of 6 km/h in still water. If the river's current flows at 1.2 km/h, and it takes him exactly 1 hour to row to a destination and back, what is the total distance he covers during the trip?
8.A man rows at a speed of 6 km/h in still water. If the river current flows at 1.2 km/h, and it takes him exactly 1 hour to row to a certain point and return, what is the distance to that point?
9.A man swims 72 km downstream and 45 km upstream, taking 9 hours for each journey. What is the velocity of the current?
10.A swimmer covers 30 km downstream and 18 km upstream, taking 3 hours for each journey. What is the swimmer's speed in still water?
11.A boat travels at 25 km/h against the current and 35 km/h with the current. What is the speed of the river's current?
12.A person rows a boat at 25 km/h against the current and 35 km/h with the current. What is the speed of the boat in still water?
13.A person rows a boat at 15 km/h in still water. If the current flows at 5 km/h, what is the boat's speed while moving downstream?
14.A swimmer can swim at a speed of 4.5 km/h in still water. If it takes him twice as long to swim upstream compared to downstream, what is the velocity of the current?
15.A man rows his boat downstream at 6 km/h and upstream at 4 km/h. What is the speed of the stream?
16.A boat covers 100 km downstream in 10 hours and travels 75 km upstream in 15 hours. What is the speed of the current?
17.A swimmer can move at a speed of 4 km/h in still water. If the river current flows at 2 km/h, how long will it take him to swim 6 km upstream against the current?
18.A man rows a boat at 5 km/h in still water. If his speed against the current is 3.5 km/h, what is his speed when rowing with the current?
19.A man takes twice the time to row a certain distance upstream compared to rowing the same distance downstream. What is the ratio of the boat's speed in still water to the speed of the stream?
20.A boat travels in still water at a speed of 9 km/h, while the current flows at 1.5 km/h. If a man rows to a destination 105 km away and then returns to his starting point, how long does the entire journey take?