A car travel at a speed of 40km/hr for DIStance of 20 km and the next of 20km with a speedof 60km/gr find the average speed

The average speed will be: 48 km/h  

Step-by-step explanation:

FOR FIRST 20 KM

Distance covered by a car = 20 km

Speed at which the first 20 km distance was covered = 40 km/hr

So

Time taken to cover first 20 km distance= 20 ÷ 40 = 1 ÷ 2 hrs

FOR NEXT 20 KM

Distance  = 20 km

Speed at which the next 20 km distance was covered = 60 km/hr

Time taken to cover first 20 km distance = 20 ÷ 60 = 1 ÷3 hrs

so

Total time = Time taken to cover first 20 km distance + Time taken to cover first 20 km distance

                            ∵

So total time = 5/6 hours

Thus,

average speed =

                                  ∵

                            km/h

Therefore, the average speed will be: 48 km/h                    

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