Munna covers one-third of a road at 3 km/h and the remaining distance at 6 km/h. His average speed is-

Question: Munna covers one-third of a road at 3 km/h and the remaining distance at 6 km/h. His average speed is-

Solution:
ধরি, রাস্তাটির দূরত্ব x km
3 km/h বেগে অতিক্রম করে x/3 কিমি ও
6 km/h বেগে অতিক্রম করে = (x - x/3) কিমি
= 2x/3 কিমি

গড় বেগ = (2x)/{(x/3/3) + (2x/3/6)}
= x/(x/9 + x/9)
= 9/2
= 4.5 kmph