On a 60km straight road a bus travels the 30km with a uniform speed of 30km/h. How much fast the bus travel the next 30km. So as to have average speed of 40km/h for the entire trip?
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Average Speed = 
40 km/h = 60 km / x
x = 60 / 40 = 1.5 hr = 1 hr 30 min
V₁ = 30 km/h D₁ = 30 km T₁ = 30 / 30 = 1 hr
T₂ = x - T₂ = 1 hr 30 min - 1 hr = 30 min = 0.5 hr D₂ = 60 - 30 = 30 km
V₂ = D₂ / T₂ = 30 / 0.5 = 300 / 5 = 60 km/h
40 km/h = 60 km / x
x = 60 / 40 = 1.5 hr = 1 hr 30 min
V₁ = 30 km/h D₁ = 30 km T₁ = 30 / 30 = 1 hr
T₂ = x - T₂ = 1 hr 30 min - 1 hr = 30 min = 0.5 hr D₂ = 60 - 30 = 30 km
V₂ = D₂ / T₂ = 30 / 0.5 = 300 / 5 = 60 km/h
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