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The speed of the ship in still water is 20 kilometers per hour, and the water speed is 4 kilometers per hour. It takes 5 hours for the ship to sail downstream from wharf a to wharf a, and then return to wharf a. the distance between wharf A and wharf B must be determined before Monday
The actual speed of a ship is determined by the speed of the ship in still water and the speed of water
The ship's downstream velocity is the ship's velocity in still water + water velocity = 24
The velocity of the ship against the current is the velocity of the ship in still water - water velocity = 16
If the distance between two wharves is x km, then
The downstream time is x divided by 24, and the upstream time is x divided by 16
x/24+x/16=5
The solution is x = 48
So it's 48 kilometers away
A ship sails to and fro the two docks a and B 224km away. It sails along the water for 7h and against the water for 8h to calculate the ship's velocity and water flow velocity in still water
Knowledge points: downstream speed = ship's speed in still water + current speed, upstream speed = ship's speed in still water - current speed
Downstream speed 224 / 7 = 32
Upstream speed 224 / 8 = 28
According to the sum difference formula, the flow velocity (32-28) / 2 = 2
Ship's speed in still water (32 + 28) / 2 = 30
A. The distance between wharf B and wharf B is 120km. It takes 5 hours for a ship to travel from wharf a upstream to wharf B. the speed of the ship in still water is 22km / h. how long does it take for a ship to return from wharf B to wharf a
First, calculate the water flow velocity, and make the water flow velocity X,
5 * （22+X）= 120
X = 2 (m/s)
Therefore, the time required for the ship to return from wharf B to wharf A is 120 / (22-2) = 6 hours
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