To calculate the distance traveled by a bus, you can use the formula:
Distance = Speed × Time
In this case, the speed of the bus is given as 84 km/h, and the time is 3 hours. Plugging these values into the formula, we get:
Distance = 84 km/h × 3 hours
Distance = 252 kilometers
Therefore, the bus will travel a distance of 252 kilometers in three hours at a speed of 84 km/h.