Generally the one that arrived first.
In a scenario where two cars arrive at an intersection at the same time, the car on the right typically has the right of way.
The car on the right.
When two cars arrive at an intersection at the same time, the proper protocol for determining the right of way is to yield to the vehicle on the right. This means that the car on the left should wait for the car on the right to proceed first.
At a four-way stop intersection, the car that arrives first has the right of way. If two cars arrive at the same time, the car on the right has the right of way.
At a four-way stop intersection, the car that arrives first has the right of way. If two cars arrive at the same time, the car on the right has the right of way.
When two cars reach an intersection at the same time, the car on the right has the right of way.
When two vehicles arrive at a four-way stop intersection at the same time, the vehicle on the right has the right of way.
When two vehicles arrive at stop signs in an intersection at the same time, the vehicle on the right has the right of way.
When two cars approach an intersection at the same time, the vehicle on the right typically has the right of way.
When two cars reach an intersection at the same time, the vehicle on the right typically has the right of way.
When two cars arrive at a stop sign at the same time, the car on the right has the right of way.
At a standard 4-way intersection, the drivers of any three cars arriving at exactly the same time can easily tell which one is on the right. Each driver looks to his (or her) right. Two of them will see a car to their right. One will see an unoccupied part of the intersection, or a car that clearly arrived after the first three. That is the car "on the right" and the one that should go first. If four cars arrive at the intersection simultaneously (very unlikely) it is almost certain the at least one of the drivers will believe he (or she) got there first and will pull into the intersection. The rest will follow in reasonable order.