GMAT Problem Solving

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Source: PREP

Level: 0

Company C has a machine that, working alone at its constant rate, processes 100 units of a certain product in 5 hours. If Company C plans to buy a new machine that will process this product at a constant rate and if the two machines, working together at their respective constant rates, are to process 100 units of this product in 2 hours, what should be the constant rate, in units per hour, of the new machine?

  • A 50
  • B 45
  • C 30
  • D 25
  • E 20

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