1Mediumprelims2 marks
In a 500 metres race, B starts 45 metres ahead of A, but A wins the race while B is still 35 metres behind. What is the ratio of the speeds of A to B assuming that both start at the same time?
A25 ∶ 21
B25 ∶ 20
C5 ∶ 3
D5 ∶ 7