The area of a square field is 900 km2. How long will it take for a horse to run around at the speed of 12 km/h ?	Choose the correct answer:
A) 12 h  B) 10 h  C) 8 h  D) 6 h  E) None of these
Explanation Area of field = 900 km2. Then, each side of field = √900=30km Distance covered by the horse = Perimeter of square field = 30 × 4 = 120 km ∴ Time taken by horse = distances/peed=120/12= 
<gadget id="calculator">120/12</gadget>
<output>10</output>
10h Answer 10 h
<result>B</result>
The area of a square field is 900 km2. How long will it take for a horse to run around at the speed of 12 km/h ?