The relationship between speed and time is inversely proportional, which means that as one increases, the other decreases.
In this case, the ratio of time is 5:5/3, which means that for every 5 units of time, there are 5/3 units of time. If we increase the ratio of time to 3:1, this means that for every 3 units of time, there is 1 unit of time.
Since speed is inversely proportional to time, this means that the ratio of speed is 1:3. This means that for every 1 unit of speed, there are 3 units of speed.
If the speed required is 320 km/hr, then the required speed to cover the distance in 3 units of time would be 320 km/hr * 3 = 960 km/hr.