To do a job alone, it would take dan 6 hours, fran 2 hours, and stan 3 hours. how long would it take to do the job if they all worked together? show process .

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.