Question

A government office opens at 7 in the morning and closes at 3 in the afternoon. How long is this office open?

Answer 1

3 in the afternoon = 15 hrs in 24 hrs clock

Hrs.	Min.
1 5	0 0	Closing time
-   7	0 0	Opening time
8	0 0

∴ The office remains open for 8 hours.