Question

assume the distance between city A and city B is 800km a person travel between city A and city B at the speed of 90km per hour and he return back to city A at the uniform speed of 60km per hour determine the average speed of the total journey
(a) 81km/hr
(b) 72km/hr
(c) 45km/hr
(d) 91km/hr​

Answer 1

Answer:

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