RRB NTPC Mains or Stage 2 Model Paper 7 with solutions

Question : 34 of 120

Marks: +1, -0

The ratio between the length and the breadth of a rectangular park is 3 : 2. If a man cycling along the boundary of the park at the speed of 12km / hr completes one round in 8 minutes, then the area of the park (in sq. m) is:

15360
153600
30720
307200

Validate

Solution:

(b) Perimeter = Distance covered in 8 min.

[12000/60× 8] m =1600 m.

Let length = 3x metres and breadth = 2xmetres.
Then,

2 (3x + 2x) = 1600 or x = 160.

∴Length = 480 m and (b)readth = 320 m.∴(a)rea

= (480 × 320) m^2 = 153600 m^2.

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