D 1= 180 Km, S1= 20 Km/hr, D2= 100 Km, S2 = 20 Km/hr, D3= 40 Km, S3= 20 km/hr. T1= 180/20= 9 hr. T2 = 100/20= 5 hr. T3= 40/20=2 hr. Average Speed = 320/16=20 km/hr.
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