8. A man walks 6 km at 12 km/h and returns at 10 km/h. Find his average speed.
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Answer:
Distance on way = 6 km
Distance both ways = 6 x 2 = 12 km
The time taken on the way there:
Time = Distance ÷ Speed
Time = 6/12 = 0.5 hour
The time needed on the return trip:
Time = Distance ÷ Speed
TIme = 6 ÷ 10 = 0.6 hour
Total time taken:
0.5 + 0.6 = 1.1 hour
The average speed:
Speed = Total Distance ÷ Total time
Speed = 12 ÷ 1.1 = 10.91 km/hour
Answer: 10.91 km/hour
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