a) 31 cm
b) 24cm
c) 25 cm
d) 24.5 cm

Answer: c
Explanation:

Let MN = Ramesh’s fort & PQ = Suresh’s fort
From the diagram we can see that
MR = 24 cm & PR = 15 – 8 = 7 cm
By Pythagoras theorem,
Hypotenuse² = (side1)² + (side2)²
$$\eqalign{ & {\text{MP}} = \sqrt {{{24}^2} + {7^2}} \cr & {\text{MP}} = 25\,{\text{cm}} \cr} $$