Question

Question
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A motor vehicle travelled the first 1/3 of a distance s at a speed of v1

= 10 kmph, the second 1/3 at a

speed of v2

= 20 kmph and the last 1/3 at a speed v3

= 10 kmph. Determine the mean speed of the

vehicle over the entire distance s. [ ]

a) 18 kmph b) 12 kmph c) 20 kmph d) 10 kmph

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Answer 1

Answer:

Let the total distance traveled be s.

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

1

=

v

1

s/3

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

2

=

v

2

s/3

Answer 2

卂几丂山乇尺 :-

v1 = 1/3*10 = 10/3

v2 = 1/3*20 = 20/3

v3 = 1/3*60 = 60/3

Mean = v1 + v2 + v3

= 10/3 + 20/3 + 60/3 and all divided/3

= 90/3/3

= 10kmph

hope it will help you ❣️❣️