AP EAPCET 24-Aug-2021 Shift 1 Paper

Given that, specd of train from city- A to city-B.
v1=18m∕s
Specd of train from city-B to city- A
v2=36m∕s
In this process, the distance travelled by train from A to B and B to A will be equal.
Now, using the expression of average speed for equal distance, we know
vav=

2v1v2

v1+v2

By substituting the values, we get
vav=

2×18×36

18+36

=

2×36×18

54

=

72

3

m∕s