Question
A car travels from city ‘A’ to city ‘B’ covering
(1/3)rd of the total distance in 5 hours and the rest in 7 hours. If it takes 8 hours to return to city ‘A’ from city ‘B’, determine the average speed for the entire journey, given that the distance between city ‘A’ and city ‘B’ is 90 km.Solution
ATQ,
Average speed = total distance covered ÷ total time taken
Total time taken = 5 + 7 + 8 = 20 hours
Total distance covered = 90 × 2 = 180 km.
Required average speed = 180/20 = 9 km/h
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