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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 =33.75km75 km
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
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