Tell if it is a direct or indirect proportion

1. The speed of a boat and the distance traveled in a certainperiod of time.

2.The speed of a car and the time required to pass thecross-harbor tunnel.

3.The number of members in a family and their total savings.

solve the following:

1. Seven pipes can fill a water tank in 6 hours. Find the timerequired for 9 pipes to fill up the tank.

2. A bookshelf holds 30 books each 3 cm thick. How many bookscan the bookshelf if each book is 2.5 thick?

3. a group of scouts forms 8 rows with 15 scouts in each row.how many rows can be formed if there are 12 scouts in each row?

4. If 6 men can paint a wall in 64 hours, find the number of menrequired to paint the wall in 48 hours.