Question

A motorcycle drives from a to b with uniform speed of 30km/h and return back with a speed of 20km/h find its average

Answer 1

Hi.
Here is your answer------

Let the distance between A and B is x km

speed of the motorcyclist drive from A to B= 30 km/hr.

Using formula,
                  Time taken  = distance/speed

So, time taken = x/30 hours.

 Also, Speed of the motorcyclist drive from B to the A = 20 km/hr

so, time taken = x/20 hours.

Total time taken = x/30 + x/20                                                  
                          = x/12 hours

Also, total distance covered by boy = x +x                                                                                                                              = 2 x km.
  Using formula,               
                        Average speed = Total distance/ Total time                                                                                             = 2 x/(x/12)                                                                
                                                 = 24 km/hr.

Thus, average speed of the boy's journey is 24 km/hr.

Hope this will help u.

Have a nice day.

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