What is the most appropriate estimate for 10.2 divided by 2.3

A. 2
B. 5
C. 10
D. 20

B 5

Step-by-step explanation:

Estimate 10.2 as 10

2.3 as 2

10/2 =5

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

answer is  

d.

3.09

hope you got this right.