Question

1)A car travels from the place A to B with a speed of $V_{1}$. During its return journey from B to A its speed is $V_{2}$. Then the average speed in complete journey is...(please I need the explanation).

2) If a car covers first 2/5th of the total distance with a speed $V_{1}$ and remaining 3/5th of the total distance with a speed of $V_{2}$, then its averag speed is...(Explain me)

3)A body has a speed of V, 2V and 3V in the first 1/3 distance, second 1/3 distance and the remaining of the total distance respectively. then the average speed is...
(Explanation is needed)...

Answer 1

Answer:

2v1+v2 km/hr

Explanation:

avg speed = \frac{totaldistance}{totaltime}totaltimetotaldistance

if no time is given we assume it as 1+1

therefore\frac{v1+v2}{2}2v1+v2 km/hr