Harmonic mean + work - math problems

Number of problems found: 64

  • Workers
    Two workers would fulfill a certain task when working together for 5 days, the first if he worked himself done work in 13 days. How many days will do the whole job a second worker?
  • Drinking water
    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?
  • Pool
    If water flows into the pool by two inlets, fill the whole for 19 hours. The first inlet filled pool 5 hour longer than the second. How long pool take to fill with two inlets separately?
  • Tractors
    Fields go plow two tractors with various performances. The first tractor plows the whole field in 11 hours, the second tractor plows the whole field 19 hours longer. How long take plow the whole field with two tractors?

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