1) A car covers 30 km at a uniform speed of 60 km/h and the next 30 km at a uniform speed of 40 km/h . Find the total time taken by the car .

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Solution

Let T₁ is the time taken by the car to cover 30 km.
Since, Time = Distance/ Speed
So, T₁ = 30 km/60km/hr = 0.5 hr

Let T₂ is the time taken by the car to cover next 30 km.
So, T₂ = 30/40= 0.75 hr
Total time taken by the car, T = T₁+ T₂ =(0.5 + 0.75)hr = 1.25 hr

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