Answer:
5 : 3
Explanation:
Given that :
SAM:
Walks 5 laps in 30 minutes
SAM'S BROTHER:
walks 3 laps in 30 minutes
Ratio of the number of laps Sam walks to that which is brother walks :
In 30 minutes the ratio of the number of laps walked by Sam to that of his brother is :
Sam's laps : brother's laps
5 : 3