A car covers 30km at a uniform speed of 30 m/hr. What should be its speed for the next 90 km if the
average speed for the entire journey is 60 km/h?
plz answer
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Answer:
Given: total distance= 120 km
Avg. Speed = 60 km/h
Time taken by car to cover 30 km= 30/30= 1 hr
Let the speed of car for next 90km be x
So, the time taken to complete 90 km = 90/x
Now, Avg. Speed = total distance/ total time taken
60 = 120/(1+(90/x))
60(x+90)= 120x
60x + 5400 = 120x
60x = 5400
x = 90 km/h (speed for next 90 km)
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