Question

How many hours are there in 82800 seconds?

• A. 25
• B. 23
• C. 34
• D. 20

Answer 1

The correct option is B 23

Number of seconds in a minute = 60
Number of minutes in an hour= 60
Let's first find the number of minutes in 82800 seconds.
Number of minutes = 82800 $÷$ 60
Since both have a common factor of 10, we just have to divide 8280 by 6.

$$\begin{array}{c}1380\\ 68280\\ -\underset{–}{6}2\\ 22\\ -\underset{–}{18}\\ 48\\ -\underset{–}{48}\\ 00\\ -\underset{–}{00}\\ 0\end{array}$$Thus, 8280 ÷ 6 = 1380.
So, we have 1380 minutes.
Now, to calculate the number of hours, we need to again divide it by 60. Again, cancelling the common factor of 10, we need to divide 138 by 6

$$\begin{array}{c}23\\ 6138\\ -\underset{–}{12}2\\ 18\\ -\underset{–}{18}\\ 0\end{array}$$Thus, 138 ÷ 6 = 23.
So, the answer is 23 hours