The Ferris Wheel at the school fair has radius of 6 metres. It revolves at the rate of one revolution per 1 minute. How many seconds does it take a rider to travel from the bottom of the wheel to a point 3 vertical metres above the bottom?
An umbrella is made by stitching 11 triangular pieces of cloth each piece measuring 24 cm, 13 cm and 13 cm. How much cloth is required for this umbrella?
Clara got an average score of 84.25 in 4 tests. She got 85 as the average of the highest 3 scores, and her lowest two scores are the same numbers. What is the average of her highest two scores?