Discussion of Question with ID = 052 under Areas

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Question

The length and breadth of a rectangular area are in the ratio 9 : 7. What is the length of the field if a car travelling at 15 km/h covers one round of the rectangle in 384 minutes?

A

27 km.

B

29 km.

C

25 km.

D

31 km.

Soln.
Ans: a

Let L = 9x and B = 7x. Perimeter = 2 × (9x + 7x) = speed × time = (15 × 384)/60 = 96 km. So x = 3, and L = 9x = 27 km.


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