Arithmetic question with distance speed and time

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If I have a time of departure with is 10:35 and I have an arrival time of 12:55 and the distance 36km how do I calculate average speed? I get the formula of distance speed and time but it says the answer is 15 3/7 km/hr and I’m really confused on how it is.

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Once you calculated 2 1/3 hours, you can figure out what to do next with units. The answer is speed, which has units (distance)/(time). So you divide the distance (36 km) by the time (2 1/3 hours) to get 15 3/7 km/hr.