Discussion of Question with ID = 092 under Areas

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Question

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?

A

9 km.

B

11 km.

C

7 km.

D

13 km.

Soln.
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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