1.

Ametorvet le travelled the first 1/3 of adistances at a speed of 10 kmph thesecond 1/3 at a speed of 20 kmphand the last 13 at a speed of10 kmph Determine the mean speedof the vehicle over the entire distance8 km​

Answer»

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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