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Cuboid: 1/l + 1/b + 1/h = surface area / (2 x volume)

This type of question, asked 2 times: CDS 2 2020, CDS 2 2022. All 2 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    CDS 2 2020

    90
    If p, q, r, s and t represent length, breadth, height, surface area and volume of a cuboid respectively, then what is 1p+1q+1r\frac{1}{p} + \frac{1}{q} + \frac{1}{r} equal to ?

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  2. Question 2

    CDS 2 2022

    83
    Let x, y, z be the length, breadth, height of a cuboid. If its volume is 400 cubic cm and total surface area is 340 square cm, then what is x−1+y−1+z−1x^{-1} + y^{-1} + z^{-1} equal to ?

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