Question
A car moves from city ‘A’ to city ‘B’ at 50 km/h
and returns back from city ‘B’ to city ‘A’ at 75 km/h. Find the car’s average speed during the entire round trip.Solution
ATQ,
Let the distance between city ‘A’ and ‘B’ = D km
Average speed = Total distance / Total time
Average speed = (D + D) / [(D / 50) + (D / 75)]
= 2D / [(3D + 2D)/150]
= 2D / (5D / 150)
= (2D / 5D) × 150
= 60 km/h
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