Aston challenges his father to a 100-m race. Aston runs 4 m for every 5 m his father runs. a) Who wins the race? Draw a diagram to show your answer. b) How far will Aston have run when his father crosses the finish line? c) Aston asks to race again but wants to be given a head start. How much of a start should Aston's father give him to make it a close race?