Did You Find Out? Get the Answer to the Riddle of E-News Issue No. 1, February 2023
Painting Work
How long will it take them together to completely paint the last wall?
The Smith painting company is to paint an exterior wall with four identical walls. The first wall is painted by the master painter himself. This work takes him two hours. Meanwhile, the apprentice paints the second wall. Since he is not yet as experienced, he takes twice as long as his master, who also paints the third wall in this time.
To finish the job quickly, the two decide to paint the last wall together after their lunch break.
How long will it take them together to completely paint the last wall?
Solution
Since the master works twice as fast as the apprentice and they both work the same amount of time, the master paints 2/3 of the wall and the apprentice paints 1/3.
It takes the master 2/3 of 120 minutes to paint 2/3 of the wall. So together they will take 80 minutes to paint the entire wall.
台灣倍加福有限公司
信義路5段150巷2號21樓之4
信義區
11059 台北市 臺灣
臺灣
fa-info@tw.pepperl-fuchs.com
+886 2 27227708
Pepperl+Fuchs 倍加福是領先全球的電子感測器 和 零組件的開發與製造商. 超過七十年的不斷創新、穩定的品質與持續的業績增長，成就了今日的我們， Pepperl+Fuchs 倍加福在全球擁有 6,300 名員工，並在德國、美國、新加坡、匈牙利、印尼和越南都設有製造工廠，其中多數工廠已通過 ISO 9001 認證