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Time taken to travel 20 km at 60 km/hr
t1 = 20/60 = 0.33hr
time taken to travel next 20 km at 80 km/hr
t2 = 20/80 = 0.25 hr
total distance 40 km
total time= 0.58 hr
avg speed = total distance
travelled/total time
taken = 40/0.58 = 68.96 km/hr
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