Question

A car travel 100km at speed of 60km/h and a return with speed of 40km/h calculate the average speed of journey

Answer 1

hye

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A car travel 100km at speed of 60km/h

so the time = d/s
                 
                     = 100/60

                       = 5/3 hour

it returns 100 km with speed of 40km/h

=> time = d/s
                 
                     = 100/40

                       = 5/2 hour

=> average speed =  total distance / total time 

  the total distance is  100 +100km 

 =>200km

and the total time is 5/3 +5/2

 =>25/6 hr [lcm]

=>average speed  = $\frac{200}{25/6}$

                               = $\frac{200*6}{25}$

                               = 8*6

                                = 48 kmph

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hope it helps u..........................

Answer 2

Answer:

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