the area of a square field is 400 km 2 . how long will it take for a horse to run around at the speed of 20 km / h ?
explanation area of field = 400 km 2 . then , each side of field = √ 400 = 20 km distance covered by the horse = perimeter of square field = 20 × 4 = 80 km ∴ time taken by horse = distances / peed = 80 / 20 = 4 h answer c
divide(multiply(const_4, sqrt(400)), 20)