A car travels at a speed of 40 km/h for 10 mins,then at 55 km/h for 20 mins and finally at 20 km/h for 20 mins.what is the average speed of a car??
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First speed 40 for 10mins
second speed 55 for 20mins
third speed 20 for 2mins
Total speed＝40+55+20＝115
Total time ＝20+20+10＝50
average speed＝total speed /total time
average speed ＝115/50
average speed ＝2.3km/h
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