A person crossing a street at various examples usually involves calculating speed by dividing the distance by the time taken and converting units appropriately. For instance, if a person crosses a 600-meter long street in 5 minutes, their speed in km/h is calculated as follows:

• Convert 600 meters to kilometers: 600 m = 0.6 km
• Convert 5 minutes to hours: 5 min = 5/60 = 1/12 hours
• Speed = Distance / Time = 0.6 km / (1/12) hours = 7.2 km/h

Similarly, for a 1600-meter long street in 4 minutes, the speed is calculated as:

• Distance = 1600 m = 1.6 km
• Time = 4 min = 4/60 = 1/15 hours
• Speed = 1.6 km / (1/15) hour = 24 km/h

Thus, given the distance of the street and the time taken, the speed of a person crossing can be calculated using the formula speed = distance/time with appropriate unit conversions.