Distance divided by time.
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there is none its slowing so its decelerating
Easy - 20 minutes is one-third of an hour, and the bus traveled 30km. Multiply that 30km by three and that gives the total distance it would travel in one hour. Answer is an average speed of 90kmh.
80 km per hour
300km in 3 hours = 100km per hour
50 miles per hour