Correct Answer - Option 3 :
\(\frac {s}{2t}\)
Given :
p, q, r, s and t represent length, breadth, height, surface area and volume of a cuboid respectively.
Formula used :
The surface area of cuboid = 2(lb + bh + hl) (where l, b and h are length, breadth and height of cuboid respectively)
Volume of cuboid = lbh
Calculations :
Surface area of cuboid(s) = 2(pq + qr + rs) (p, q and r represent length, breadth and height respectively)
Volume(t) = pqr
(1/p) + (1/q) + (1/r) = (pq + qr + qr)/pqr (pq + qr + rs = s/2)
⇒ s/(2t)
∴ Option 3 is the correct answer.