a bus travels first 30km with a uniform speed of 60km/hr and next 30km with uniform speed of 40km/hr. calculate 1. total time of journey 2. average speed of bus.
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30/60 + 30/40 = 0.5 + 0.75 = 1.25 hrs
average speed = total distance /total time
60/1.25 = 48km/h
average speed = total distance /total time
60/1.25 = 48km/h
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