Question

5. A particle goes A to M with a speed of 30 km/h and M
to B with a speed of 50 km/h. If MB = 5AM, the aver-
age speed in km h for the whole journey is:
(A) 45 kmh (B) 40 km/h
(C) 36 kmh (D) 34 km/h​

Answer 1

Answer:

45 km/hr

Explanation:

total time= (x/30)+(5x/50)  

               = 4x/30

total distance = 6x

average speed = d/t = 6x*30/4x

                                  = 45 km/hr