Question

A car covers 30 Km at a uniform speed of 30km/h what should be speed for next 90 km for an average speed for the entire journey is 60 km/hr

Answer 1

Answer:

90 km

Step by step explanation:

Given: Total distance=120km

Average speed=60 km/hr

Time taken by the car to cover 30 km=30/30=1hr

Let the speed of car for next 90 km be x

So, the time taken to complete 90 km=90/x

Now, Average speed=Total distance/Total Time Taken

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

60(x+90)=120x

60x+5400=120x

60x=5400

x=5400/60

x=90km/h (speed for next 90 km)

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