Answers

2016-02-25T20:41:31+08:00
First, convert 3 mins. to secs. Since, 60 secs. = 1 min., we'll have 90 secs : 270 secs. Therefore, the ratio is 90 secs : 270 secs, or 1 : 3. 

Please, kindly correct me if I'm wrong. ^-^
0