It is 40: 120 which can be simplified, if required.
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90 seconds = 1.5 minutes. So the ratio is 1.5 : 3 or 1:2
2 minutes and 40 seconds
2 minutes = 120 seconds. So the ratio is 10 : 120 or 1 : 12
That's a total of 9,600 seconds.
To find the ratio of 20 seconds to 2 minutes, you need to convert both units to the same time measurement. Since there are 60 seconds in a minute, 2 minutes is equal to 2 x 60 = 120 seconds. Therefore, the ratio of 20 seconds to 2 minutes is 20:120, which simplifies to 1:6.