The area of a square field is 1600 km2. How long will it take for a horse to run around at the speed of 16 km/h ?  Choose the correct answer:
A) 12 h
B) 10 h
C) 8 h
D) 6 h
E) none of these

Rationale: explanation area of field = 1600 km 2 . then , each side of field = √ 1600 = 40 km distance covered by the horse = perimeter of square field = 40 × 4 = 160 km ∴ time taken by horse = distances / peed = 160 / 16 = 10 h answer b
Answer: B