Question

a person walks for 1km and return back walks for 200 m revolves more if he takes a total time of 20 minutes calculate first speed and second velocity​

Answer 1

Answer:

Correct option is

B

24 m/s

Let the total distance be 2x.

For first half distance :

Speed is 20 m/s

Thus time taken t

1

=

20

x

For second half distance :

Speed is 30 m/s

Thus time taken t

2

=

30

x

Average velocity V

avg

=

t

1

+t

2

2x

⟹ V

avg

=

20

x

+

30

x

2x

=

20+30

2×20×30

=24 m/s