Two rooms

Woman cleans the room in 30 minutes a man in 90 minutes. How long will take they clean two rooms?

Correct answer:

t =  45 min

Step-by-step explanation:


t/30+t/90 = 2

4t = 180

t = 45

Our simple equation calculator calculates it.



Did you find an error or inaccuracy? Feel free to write us. Thank you!



avatar







Tips to related online calculators
Looking for calculator of harmonic mean?
Looking for a statistical calculator?
Need help to calculate sum, simplify or multiply fractions? Try our fraction calculator.
Do you have a linear equation or system of equations and looking for its solution? Or do you have a quadratic equation?
Do you want to convert time units like minutes to seconds?

Related math problems and questions:

  • Cleaners
    clean Milan would clean up the room for 2.5 hours, Eric would take 10 hours. How long they swept the room together?
  • Flowerbed
    flowers Ondra digs the bed in 20 minutes. Cuba in 30 minutes. For how long do they dig together?
  • Reading records
    clock-night-schr Lucy, Tereza, and Petra decided to compile the compulsory reading records together. It would take 30 days for Lucia alone, 36 for Tereza and 45 for Petra. How long will it take to make records if they will work together?
  • Drinking water
    blue-barrel A man drinks a keg of water in 40 days, and a woman drinks in 62 days. How many days do they consume a keg together?
  • The leaves
    garden Karel would rake the leaves in the garden alone in 24 minutes, his younger brother would take 30 minutes. How long would they dig a garden, if Karel digs alone for 6 minutes and then his brother comes to his aid?
  • Your Mom
    cleaning Your Mom can clean your entire house in 3 hours. However, your dad takes 5 hours to clean the house. How long it will take for them to clean the house if they work together? (Write the numerical answer round to the nearest thousandth)
  • In and out
    inlets The empty tank is filled in 12 minutes and empty in 16 minutes. How long does it take to fill if we forgot to close the drain? If the tank has 1000 l.
  • Floating floor
    floor In the new building is considered a floating floor worker in each room. 30 minutes lay 9 m2 of the floor. How long 3 workers laid the floor in 4 rooms with a total area of 90 m2?
  • Two brothers
    workers Two brothers want to collect 20 kg of chestnuts. If only Marek collected, he would make it in 30 minutes. It would take Milan 10 minutes longer. How long after Mark does Milan have to start collecting to be finished in 18 minutes?
  • The dam
    prehrada-orlik The water reservoir is filled with first tributary for 25 hours second tributary for 35 hours. Some time were both inlets open, then a second tributary closed and the tank was filled in four hours. What time water flowed from both tributaries? (Expressed
  • Water reservoir
    nadrz One drain hole emptied the water from the tank for 20 hours, with the second drain for 30 hours. How long will the water drain from this tank if we open two drains simultaneously?
  • Five pupils
    lavicka Five pupils clean 30 chairs one hour before four pupils. How many chairs clean one pupil in 1 hour?
  • Pond
    rybnik2 A pond with two open floodgates will emptied in 20 days. A larger floodgate will emptied whole pond in 30 days. For how long would he be emptied with a smaller floodgate.
  • Boots
    vysoke-cizmy Master shoemaker has three apprentices. First do one pair of boots for two days, second for one day, third on 1.5 days. If they worked together, for how long would it take to make a couple of boots?
  • Inflow - outflow
    water_barrels The tank will fill by inflow for 143 minutes and empties by outflow for 150 minutes. How long take to fill tank if it is also opened the inflow and outflow?
  • Two pumps
    nadrz The first pump fills the tank in 24 hours second pump in another 40 hours. For how long will it take to fill the tank if it operates both pumps at the same time?
  • The coal
    coal The coal stock would be enough to heat a larger room for 12 weeks, a smaller one for 18 weeks. It was heated for four weeks in both rooms, then only in a smaller one. How long was the coal stock enough?