Question

A car covers 30 km at a uniform speed of 30 km/h. What should be its speed for the next 90 km if theaverage speed for the entire journey is 60 km/h?​

Answer 1

A car covers 30 km at a uniform speed of 30 km/h. What should be its speed for the next 90 km if the average speed for the entire journey is 60 km/h?​

Step-by-step explanation:

We are given: total distance= 120 km

Average Speed = 60 km/h

The Time taken by the  car to cover a distance of  30 km= 30/30= 1 hr

Let the speed of car for next 90km be x

∴ the time taken to complete 90 km = 90/x

Average Speed = total distance/ total time taken

60 = 120/(1+(90/x))

60(x+90)= 120x

60x + 5400 = 120x

60x = 5400

x = 90 km/h

Answer 2

Answer:

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Step-by-step explanation:

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