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Answer:
Explanation:
t = (½d)/60 + (½d)/40
t = (½d)/60(2/2) + (½d)/40(3/3)
t = (½d)2/120 + (½d)3/120
t = (½d)5/120
t = (½d)/24
t = d/48
v = d/t
v = d / (d/48)
v = 48 km/h