a, \(\text{42 giờ 40 phút : 8}+\text{8 giờ 36 phút : 6}\)

\(=\text{5 giờ 20 phút}\)\(+\text{1 giờ 26 phút}\)

\(=\text{6 giờ 46 phút}\)

b, \(\text{2 giờ 24 phút × 2 +7 giờ 24 phút ×4}\)

\(=\text{4 giờ 48 phút}+\text{29 giờ 36 phút}\)

\(=\text{34 giờ 24 phút}\)

c, \(\text{(9 giờ − 5 giờ 36 phút ) :3}\)

\(=\text{3 giờ 24 phút }\div3\)

\(=\text{1 giờ 8 phút}\)

d, \(\text{(4 giờ 16 phút + 3 giờ 34 phút ) × 4}\)

\(=\text{7 giờ 50 phút}\div4\)

\(=\text{31 giờ 20 phút}\)

\(5\left(x-3\right)=\dfrac{5}{7}\)

\(x-3=\dfrac{5}{7}\div5\)

\(x-3=\dfrac{5}{7}\times\dfrac{1}{5}\)

\(x-3=\dfrac{1}{7}\)

\(x=3+\dfrac{1}{7}\)

\(x=\dfrac{21}{7}+\dfrac{1}{7}\)

\(x=\dfrac{22}{7}\)

1. What are you doing on Saturday? I am doing homework in the morning and watching a movie at 4 p.m.

2. What are they doing on Sunday? They are collecting trash at the seaside.

3. There is a drama at the movie theater on Saturday night.

4. Let's meet at the movie theater at 6:30.

11. There is a hospital near the school.

12. The library is on the bus station.

13. The post office is between the subway and the train station.