Exercise 3m Fractions

Man A and man B working together take 10 days to complete a project. If man A alone takes 15 days to complete a project, how many days does man B require?

• 28 days

• 20 days

• 30 days

Man A takes 6 days to complete a project and man B takes 12 days to complete a project. If man A and man B work together, how many days will they require?

• 8 days

• 2 days

• 4 days

Man A takes 12 days to complete a project and man B takes 15 days to complete a project. If man A and man B work together, how many days will they require?

Man A and man B working together take 4 days to complete a project. If man A alone takes 6 days to complete a project, how many days does man B require?

• 12 days

• 11 days

• 10 days

There are three pipes A, B and C. Pipe A takes 9 days to fill up the empty pond, pipe B takes 12 days to fill up the empty pond, and pipe C takes 18 days to fill up the empty pond. How long will it take to fill up the empty pond if pipes A, B and C are turned on at the same time?

• 2 days

• 4 days

• 5 days

There are three pipes A, B and C; pipe A takes 8 minutes to fill up the pond. Pipe B takes 4 minutes to fill up the pond, pipe C takes 6 minutes to drain away all the water when the pond is full. How long will it take to fill up the empty pond, if pipes A, B and C are turned on at the same time?

• 4.8 minutes

• 5 minutes

• 3 minutes