Question

If a person travels –th of a distance at
2th
1
5
20 km/h, -th of the distance 30 km/h and
5
rest of the journey at 40 km/h, then what
is his average speed for the entire journey?​

Answer 1

Answer:

Let the total distance of the journey be d. The person travels 2d/5 distance with speed 20km/hr, ie, he takes (2d/5) /20 hours (= 8d hours) to travel that distance. Similarly he travels d/5 distance in 6d hours.