a car travels one third distance in 20km/h and rest in 60km/h . find the average speed
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Average speed is given as 2v₁v₂ / v₁ + v₂
v₁ = 20 km/h
v₂ = 60 km/h
by substituting the values ,
= 2×20×60 / 80
= 2400 / 80
= 30 km/h
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