Three computers can print out a task in 14 min, 21 min, and 42 min, respectively. How long would it take to complete the task with all three computers working?

mundocromadomg

mundocromadomg

Answered question

2022-09-18

Three computers can print out a task in 14 min, 21 min, and 42 min, respectively. How long would it take to complete the task with all three computers working?

Answer & Explanation

garnboernl

garnboernl

Beginner2022-09-19Added 8 answers

Fraction of work completed by the first computer in 1 minute = 1/14
Fraction of work completed by the second computer in 1 minute = 1/21
Fraction of work completed by the third computer in 1 minute = 1/42
Therefore fraction of work completed by all three computers working together in one minute
= 1 14 + 1 21 + 1 42 = 3 + 2 + 1 42
Since 1/7th of the work is completed in 1 minute
Time taken to complete the task with all three computers working = 7 minutes

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