Question

A particle moves for the first one third of the total
time of journey with speed 30 km/h and with speed
15 km/h for the remaining time. Average speed
during total journey is​

Answer 1

Answer:

average speed=total distance/total time=(d+2d)/(d/6)=18d/d=18 km/sec

Explanation:

total distance=3d (bcz there are 3parts)

total time=t1+t2=d/v1+2d/v2=d/6 by putting values