.

With an inequality we can apply INCREASING functions to both sides, or apply a DECREASING function and flip the inequality. Division by a positive number and are increasing functions, while division by a negative number is DECREASING (alternatively naively solve an equation for ).

To get rid of the we apply its inverse to both sides (using four significant figures):

.

To get rid of the we apply its inverse to both sides:

,

To get rid of the decreasing function we apply its inverse and flip the inequality:

,

so approximately 13 hours later.

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We will only use four significant figures for intermediate calculations.

To get rid of the we apply its inverse to both sides:

.

To get rid of the we apply its inverse to both sides:

.

To get rid of the we apply its inverse to both sides:

mm.

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