[[1]] is the ratio of 30 days to 36 hours.

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Detailed Solution

Concept: 20:1 is the ratio of 30 days to 36 hours.
Here, we'll use the formula 1 day = 24 hours to translate the supplied number of days into the corresponding number of hours. The comparable amount of hours will then be divided by 36 hours.
The ratio of 30 days to 36 hours must be determined. Both amounts are given in this instance but in various units. We will set both of these quantities' units to the same in order to determine the necessary ratio. Given that one day is made up of 24 hours, or 1 day = 24 hours, We will multiply 30 by 24 hours, to get the period of time,

The number of days is transformed into the corresponding number of hours in the equation above. Clearly, we can see that 30 days are equal to 720 hours by the equation we just found. Here, we've changed the number of days to hours.
Thus the ratio is

Hence, the correct answer is 20:1.

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