Question 16
Rakesh covers 12 km at 6 km/hr, 36 km at 9 km/hr and then 32 km at 4 km/hr. Find the approximate
average speed in covering the whole distance.
Solution
$$AverageĀ speed = TotalĀ distanceĀ covered\div TotalĀ timeĀ taken$$.
Total distance covered = 12 + 36 + 32 = 80 km.
Total time taken = $$12\div 6 + 36\div 9 + 32\div 4 = 2 + 4 + 8 = 14 hrs$$.
$$\Rightarrow AverageĀ speed = 80\div 14 = 5.71 km/hr$$.
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