Correct Answer - Option 1 : 3 : 12 : 24 : 32
Concept used:
When the time is same, then the ratio of the speeds is the same as the ratio of distances covered by them.
CALCULATION :
When Sunil covers the last 400m, Ravi completes 1600m.
∴ The ratio of the speeds of Sunil and Ravi = 400: 1600 = 1 : 4
In the same way, when Ravi covers the last 800m, Rajesh completes 1600m.
∴ The ratio of the speed of Ravi and Rajesh = 800: 1600 = 1 : 2
In the same way, when Rajesh covers the last 1200m, Suresh completes 1600m
∴ The ratio of the speed of Rajesh and Suresh = 1200: 1600 = 3 : 4
The ratio of speeds -
Sunil : Ravi = 1 : 4 = 3 : 12
Ravi: Rajesh = 1 : 2 = 12 : 24
Rajesh: Suresh = 3 : 4 = 24 : 32
∴ The required ratio of speeds is 3 : 12 : 24 : 32.