GMAT Challenge Question

This week’s GMAT challenge from is a problem solving question.

Labeling machine A working alone takes 1 minute to put labels on 100 cans and labeling machines A and B working together take 45 seconds to put labels on 100 cans. How long would it take machine B working alone to put labels on 100 cans?

  1. 25 seconds
  2. 1 minute 45 seconds
  3. 2 minutes
  4. 2 minutes 30 seconds
  5. 3 minutes

Have a go at answering this and then review your answer.

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