Question 3 - 20 marks This question is based on your work on MU123 up to and including Unit 2. (a) Keita is training for a race in her local cycling sportive. She would like to complete the 126 km course in 5 hours 15 minutes. Find Keita's average speed in km/h if she completes the course in this time. [4] (b) On the day of the race, Keita cycles at an average speed of 24.5 km/h. Find the time taken by Keita to complete the 126km route. Give your answer in hours and minutes, correct to the nearest minute. [6] (c) The route for the race is marked on a map with a scale of 1 : 250 000. The final section of the race follows the coast. If this section measures 11.3 em on the map, find the corresponding distance on the ground. Give your answer in km correct to three significant figures. [5] (d) Cyclists taking part in the event are classified by age. Keita's age category is for those aged at least 50 years but not yet 55 years old. Let a represent the age of a cyclist in years. (i) Draw a number line to illustrate the range of ages in Keita's age category. [1] (ii) Give a double inequality, using a, to describe this age range