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A and B together can finish a work in 15 days and B alone can finish it in 20 days. In how many days can A alone finish it?

1048Medium DSSSB TGT Computer Science 0 replies 1 views
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A and B together can finish a work in 15 days and B alone can finish it in 20 days. In how many days can A alone finish it?

  • A30
  • B45
  • C60
  • D75
Correct answer: C

Explanation

A's one-day work = 1/15 − 1/20 = 1/60, so A alone takes 60 days.
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