Final answer:
It takes the bus 2 hours to travel 200 km at an average speed of 100 km/hr, making option b the correct choice.
Step-by-step explanation:
To find out how long it will take for an air-conditioned bus traveling at an average speed of 100 km/hr to cover a distance of 200 km, we can use the formula for time which is the distance divided by the speed. Using this formula, we can calculate the time as follows:
Time = Distance ÷ Speed
Time = 200 km ÷ 100 km/hr
Time = 2 hours
Therefore, it will take the bus 2 hours to travel a distance of 200 km, which corresponds to the mentioned correct option in the final answer, option b.