23 A man covers first 100 km of his journey at 50 km/h, next 120 km at 54km/hr and last 30 km at 60/hr. Find his average speed through the whole journey
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total time taken is = 100/50 +120/54 + 30/60 =4.72 hours
total distance covered = 100+120+30= 250 km
average speed = total distance covered /total time taken
average speed = 250/4.72= 52.96km = 53km(approx).
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