Question 1087231
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60km/hr for 0.52 hr,30km/hr for the next 0.24hr and then 70km/hr for the next 0.71hr.
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Total Distance:  {{{60*0.52+30*0.24+70*0.71=88.1}}}, kilometers

Total Time:  {{{0.52+0.24+0.71=1.47}}}, hours



{{{AverageSpeed=(TotalDistance/TotalTime)}}}