Question

Ametorvet le travelled the first 1/3 of a
distances at a speed of 10 kmph the
second 1/3 at a speed of 20 kmph
and the last 13 at a speed of
10 kmph Determine the mean speed
of the vehicle over the entire distance
8 km​

Answer 1

Answer:

Let the total distance travelled be s.

Hence the time is taken for the first third of the distance= t

1

=

v

1

s/3

Similarly, the time is taken for the second third of the distance= t

2

=

v

2

s/3

and the time is taken for the last third of the distance= t

3

=

v

3

s/3

Hence the mean speed over the distance=

t

1

+t

2

+t

3

s

=

v

1

1

+

v

2

1

+

v

3

1

3

=18km/h

Step-by-step explanation:

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