1,407.5 hours
step-by-step explanation:
we first convert all the time to hours and then sum them up.
there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.
there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.
therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours