Answer: The answer is that you should consume less of X and more of Y.
Explanation: From the scenario presented above, we see that X gives 40 utils and it costs $8. Y gives 20 utils and it costs $4.
But since it takes 3 hours to consume X, and just 1 hour to consume Y, bearing in mind that 1 hour is equivalent to $2, then an additional $6 cost is incurred in consuming X, while an additional $2 cost is incurred in consuming Y.
Therefore the total cost incurred in consuming X and Y are:
X = $14
Y = $6
In order to determine the correct consumption combination, we will have to calculate the utility per dollar spent on each product thus:
Utility per dollar spent on X = 40/14
= 2.86
Utility per dollar spent on Y = 20/6
= 3.33
From the calculations above, we can see that more utility is derived from consuming Y than from consuming X.
Therefore, less of X should be consumed and more of Y should be consumed.