Question

A school starts at $7:20$ a.m. and closes at $1:40$ p.m. Find the duration for which the school remain open.

Answer 1

From $7:20$ a.m. to $12:00$ p.m. $\to 12:00$ -

$7:20$

$\overline{4:40}$ (4 hrs 40 minutes)

and from $12:00$ p.m. to $1:40$ p.m. $\to 1:40$

$\Rightarrow$ Total $=5$ hours $80$ minutes $=6$ hours $20$ minutes is duration for which the school remain open.