math
posted by robin .
3 pumps, working 6 hours a day, can empy a water tank in 2 days. How many hours a day must 9 pumps work to empty the same tank in 1 day?

3 pumps > working 6 hours  2 days
6 pumps > working 6 hours  1 day
1 pump > working 36 hrs  1 day
9 pumps > working 4 hrs  1 day
or
it takes 18 pumphrs running for 2 days
it takes 36 pumphrs to do it in 1 day
so 9 pumps would take 4 hrs to do it in 1 day
Respond to this Question
Similar Questions

college algebra
an inlet pipe can fill a large water tank in 3 hours. an outlet pipe can empty the same tank in 5 hours. given an empty tank, at 8pm, activate both pipes. what time on the clock will it be before the tank is completely filled? 
math 115
You can use functions to figure how much money you earn in a day..if you work "x" hours in a day and you make $"y" in a day. So let's say that you work 5 hours in a day and you make $9 an hour y=5x+9 9x5=40 would this be the right … 
math
ms. gries is an athlete. she is skis every day for 5 days. she skis for 1 1/2 hours for her first day and increases her time by 1 1/4 hours for her next four days. how many hours will she ski on the fifth day? 
maths
Three typists working 8 hours a day type a document in 10 days. If only 2 typists are working, how many hours a day should they work to finish the job in 12 days. 
math
trina works after school and on weekends. she always works three days each week. this week she worked 2 3/4 hours on monday, 3 3/5 hours on friday and 5 1/2 hours on saturday. next week she plans to work the same number of hours as … 
MATHS
3 PUMPS WORKING 8 HOURS A DAY, CAN EMPTY A TANK IN 2 DAYS. HOW MANY HOURS A DAY MUST 4 PUMPS WORK TO EMPTY THE TANK IN 1 DAY? 
Math
Each of three pumps A, B, C can pump water either into, or out of, a swimming pool. Pump A can fill the pool in 6 hours, while pumpp B works twice as fast. Pump C however takes one third more time than pump A to fill the pool. 1. All … 
Algebra
a worker has a new pump and an old pump. the new pump can fill a tank in five hours and the old pump can fill the same tank in 7 hours write and solve an equation for the time it will take both pumps to fill one tank if the pumps are … 
value
two taps F And E are connected to a water tank.tap F can fill the tank in 2hours while E can empty it in 3hours.one day when the tank was a third full of water, the taps were opened at the same time.how long did it take to fill the … 
math
by working 8 hour a day 13 farmers can plough a field in day 15 day . in how many day will 26 farmer plough the same field if they work 10 hours a day