A man travel from A to B at 20 km/hr. andcome back from B to A at 30 k – InterviewSolution

1.	A man travel from A to B at 20 km/hr. andcome back from B to A at 30 km/hr. Find theaverage speed of the whole journey?
Answer» let the distance between A to B be x kmtime(AB)=x/20 hrtime(BA)=x/30 hraverage speed= total distance/ total time =(2x)/(x/20 + x/30) =(2×20×30)/(20+30) =120/5=24 km/hr

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