Discussion of Question with ID = 092 under Areas

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The length and breadth of a rectangular area are in the ratio 9 : 2. What is the length of the field if a car travelling at 10 km/h covers one round of the rectangle in 132 minutes?


9 km.


11 km.


7 km.


13 km.

Ans: a

Let L = 9x and B = 2x. Perimeter = 2 × (9x + 2x) = speed × time = (10 × 132)/60 = 22 km. So x = 1, and L = 9x = 9 km.

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