A car travels 40 km/hr in kilometer and 60km/hr in another 1 kilometer then find the average speed in 2 km.

Question

A car travels 40km/hr in kilometer and 60km/hr in another 1km then find the average speed? 

Answer 1

The average speed is the sum of the two distances travelled, divided by the sum of the two travel times.

 

<v> = (x₁ + x₂) / (t₁ + t₂) =  (v₁t₁ + v₂t₂) / (t₁ + t₂)

 

v₁ = 40 km/hr

x₁ = 1 km

t₁ = x₁/v₁ = (1/40) hrs 

 

v₂ = 60 km/hr

x₂ = 1 km

t₂ = x₂/v₂ = (1/60) hrs

 

<v> = [40(1/40) + 60(1/60)] / (1/40 + 1/60) km/hr = 48 km/hr

 

<v> = 48 km/hr

 

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