A motorist travels the first 120 km of a journey at an average speed of 60 km/ hr, the next 100 km at 50 km/ hr. Find the average speed for the whole journey.show your working.
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Answer: 55km/hr
Ave. Speed = Total distance ÷ Total time
Total Dist. :-
120 + 100 = 220 km
Total Time :-
Time took to cover 120 km + Time took to cover 100 km.
CASE - 1
Time = Distance ÷ Speed
120 ÷ 60 = 2 hrs
CASE - 2
Time = Distance ÷ Speed
100 ÷ 50 = 2 hrs
Total Time = 2 + 2 = 4 hrs
Ave Speed = 220 ÷ 4 = 55 km/hr
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