The distance between a and B is 280km. It takes 14 hours for the ship to sail downstream to a and 20 hours for the ship to sail upstream Use binary linear equation to solve. There must be original equations listed!

The distance between a and B is 280km. It takes 14 hours for the ship to sail downstream to a and 20 hours for the ship to sail upstream Use binary linear equation to solve. There must be original equations listed!

Let the velocity of the ship in still water be XKM / h and YKM / h respectively
Then 14 (x + y) = 280 and 20 (X-Y) = 280
The solution is: x = 17, y = 3
A: the speed of the ship in still water and the current speed are 17km / h and 3km / h respectively

The distance between a and B is 280km. Does it take 14h for a bus to go downwind from a place to B place and 20h for a bus to return to B place

Let X be the wind speed, y be the speed of the bus
280/(y+x)=14
280/(y-x)=20
The solution is: x = 3, y = 17

The distance between a and B is 300 kilometers. It takes seven hours for a car to go from a to B, and five hours for a car to return. The average speed of the car to and from B is calculated
fast

Average speed of the car to and fro
: (300 + 300) / (7 + 5) = 50 (km / h)

The distance between a and B is 480 kilometers. A car drives from a to B half the way. The speed of the car is 80 kilometers per hour. The rest of the way is a few hours

The remaining distance (480 / 2) / 80 = 3 hours