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90km/hExplanation:Given : AVERAGE speed = 60 km/hTotal distance = 120 kmspeed for Ist 30KM = 30km/hTime TAKEN for Ist 30km= 1 Hr ( v=s/t ) NowAverage speed = Total distance/ Total Time 60 = 120/t t= 2 hrTotal Time = 2 hr- 1HR = 1hr (for remaining 90km)Speed = distance/Timespeed = 90/1 speed = 90km/ h



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