Races: 'A beats B by x' as distance ratios over the course

CAT has tested this idea 3 times across 3 papers, from 2017 to 2020. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.

Question	What it asks	Answer
CAT 2020 Slot 2 · QA Q1 near-repeat	A beats B by 45, B beats C by 50, A beats C by 90	D
CAT 2019 Slot 1 · QA Q19 near-repeat	first beats second by 11, third by 90; second beats third by 80	880
CAT 2017 Slot 2 · QA Q2	10 km race, 1 km leads; how much A beats C	1900

Part of Time, Speed & Distance (48 questions since 2017).