9.8 Teamwork


It takes 10 hours to fill a pool with the inlet pipe. It can be emptied in 15 hrs
with the outlet pipe. If the pool is half full to begin with, how long will it
take to fill it from there if both pipes are open?


 


 


 


 

Working alone it takes John 8 hours longer than Carlos to do a job. Working
together they can do the job in 3 hours. How long will it take each to do the
job working alone?


 


 


 


 


 

A water tank can be filled by an inlet pipe in 8 hours. It takes twice that long
for the outlet pipe to empty the tank. How long will it take to fill the tank if
both pipes are open?


 


 


 


 


 


 

Two people working together can complete a job in 6 hours. If one of them
works twice as fast as the other, how long would it take the faster person,
working alone, to do the job?


 


 


 


 

Jack can wash and wax the family car in one hour less than Bob can. The two
working together can complete the job in 6/5 hours. How much time would
each require if they worked alone?


 


 


 


 


 


 

Bills father can paint a room in two hours less than Bill can paint it. Working
together they can complete the job in two hours and 24 minutes. How much
time would each require working alone?


 


 


 


 


 

If Sam can do a certain job in 3 days, while it takes Fred 6 days to do the
same job, how long will it take them, working together, to complete the job?


 


 


 


 


 


 

If two people working together can do a job in 3 hours, how long will it take
the slower person to do the same job if one of them is 3 times as fast as the
other?


 


 


 


 


 

A carpenter and his assistant can do a piece of work in 15/4 days. If the
carpenter himself could do the work alone in 5 days, how long would the
assistant take to do the work alone?


 


 


 


 


 


 

Of two inlet pipes, the smaller pipe takes four hours longer than the larger pipe
to fill a pool. When both pipes are open, the pool is filled in three hours and
forty-five minutes. If only the larger pipe is open, how many hours are required
to fill the pool?