Question

A car travels totally a distance of ‘D’ at different speeds in the same direction as follows: 0 to D/3 at 10 kmph, D/3 to 2D/3 at 20 kmph, 2D/3 to D at 30 kmph. The average speed of the car is and follow me​

Answer 1

Explanation:

let distance to be covered is 1800.

then time taken for first 1/3 is T

1

=

10

600

=60sec

time taken for second 1/3 is T

1

=

20

600

=30sec

time taken for third 1/3 is T

1

=

60

600

=10sec

total time taken is 100 sec.

av velocity is

100

1800

=18km/s.

Answer 2

hope it's helpful to you