Question 07.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 12 km/hr completes one round in 8 minutes, then the area of the park (in sq. m) is:

(a) 15360

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(b) 153600

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(d) 307200

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Solution

The correct option is B
(b) 153600

Answer 07. (b)
Explanation:
Perimeter = Distance covered in 8 min. =(12000/608)m = 1600 m.
Let length = 3xmetres and breadth = 2xmetres.
Then, 2(3x + 2x) = 1600 or x = 160.
Length = 480 m and Breadth = 320 m.
Area = (480 320) m2 = 153600 m2.

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Question 07.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 12 km/hr completes one round in 8 minutes, then the area of the park (in sq. m) is:

The correct option is B (b) 153600 Answer 07. (b) Explanation: Perimeter = Distance covered in 8 min. =(12000/60*8)m = 1600 m. Let length = 3xmetres and breadth = 2xmetres. Then, 2(3x + 2x) = 1600 or x = 160. Length = 480 m and Breadth = 320 m. Area = (480 * 320) m2 = 153600 m2.

The correct option is B
(b) 153600

Answer 07. (b)
Explanation:
Perimeter = Distance covered in 8 min. =(12000/608)m = 1600 m.
Let length = 3xmetres and breadth = 2xmetres.
Then, 2(3x + 2x) = 1600 or x = 160.
Length = 480 m and Breadth = 320 m.
Area = (480 320) m2 = 153600 m2.