The area of a square field is 625 km2. How long will it take for a horse to run around at the speed of 25 km/h ?	Choose the correct choice
A) 12 h
B) 10 h
C) 8 h
D) 4 h
E) none of these

Rationale: explanation area of field = 625 km 2 . then , each side of field = √ 625 = 25 km distance covered by the horse = perimeter of square field = 25 × 4 = 100 km ∴ time taken by horse = distances / peed = 100 / 25 = 4 h answer d
Answer: D