| In a 500 m race, B starts 45 m ahead of A, but A wins the race while B is still 35 m behind. What is the ratio of the speeds of A to B assuming that both start at the same time? |
A) 25 : 21
B) 25 : 20
C) 5 : 3
D) 5 : 7
Correct Answer: A
Solution :
| Here, time is constant. |
| Hence, Speed \[\propto \] Distance |
| Distance covered by \[A=500\text{ }m\] |
| Distance covered by \[B=500-(45+35)\] |
| \[=500-80=420\] |
| \[\therefore \] Required ratio = 500: 420 = 25: 21 |
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