LIC AAO Model Paper 1

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Question : 43 of 160

Marks: +1, -0

The most economical speed for this Journey is :

20 kmph
30 kmph
35 kmph
40 kmph
None of these

Solution:

C =

kx^2

Where x = 16 kmph
C = Rs. 64
∴ 64 = k ×

16^2

⇒ k =

1/4

∴ C =

1/4 x^2

Total expenditure per hour
=

1/4x^2

+ 400
When speed = 40 kmph. the expenditure will be minimum

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