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Convert all the minutes that he traveled in to hours by dividing them by 60
When drove at 85kph for 15 minutes...so that in a a quarter an hour. The total distance he covered was 85x1/4=21.25 km
when he drove at 60kph for 20 minutes he covered a distance of 60x1/3=20km
when he drove at 45kph for 45 minutes he covered a distance of 45x3/4 =33.75km
He spent how many minutes in total? 15+20+45+55=135 minutes
Convert the minutes unto hours by dividing them by 60
so the average speed will be the total distance covered divided by the time taken to cover it
Please let me know if you need any clarification. I'm always happy to answer your questions.
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