Practicing Success
The area of a square park is 81 km2. What is the time taken to complete a rotation at the speed of 5 km/h? |
7 h 12 min 8 h 7 h 30 min 7 h 48 min |
7 h 12 min |
One rotation around the park = perimeter of square park = 4 × side = 4 × \(\sqrt {81}\) = 4 × 9 = 36 km Time taken to complete this rotation = \(\frac{distance}{speed}\) = \(\frac{36}{5}\) = 7.2 hr = 7 hr 12 min |