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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.