Question

an object covers first 1/3rd of distance with a 18kmph and second 1/3rd of distance with the speed of 27 kmph and last 1/3rd of distance with of speed of 9kmph then the average speed for total journey is​

Answer 1

Answer:

Let the total distance travelled be x km Then total time taken =  

10

x/3

​  

+  

20

x/3

​  

+  

60

x/3

​  

=  

30

x

​  

+  

60

x

​  

+  

180

x

​  

 

=  

180

6x+3x+x

​  

=  

180

10x

​  

=  

18

x

​  

 hrs Then average speed = =  

Totaltimetaken

Totaldistancetravelled

​  

 

=  

x/18

x

​  

 km/hr = 18 km/hr

Explanation:

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Answer 2

Answer:

14.27 kmph

Explanation:

let the total distance covered = 3x

then the average speed = total distance / total time

total time = x / 18  + x /27 + x /9

average speed = 3x / (x / 18  + x /27 + x/9)

  = 14.27 kmphr