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.
倍加福（北京）过程自动化控制设备有限公司
北京市经济技术开发区
科创十四街99号7号楼3101室
101111 Beijing
中国
pa-info@cn.pepperl-fuchs.com
+86 10 5901 7000
上海倍加福工业自动化贸易有限公司
上海市静安区市北工业园区江场三路
219号4楼
200436 上海
中国
fa-info@cn.pepperl-fuchs.com
+86 21 6630 3939
德国倍加福公司（P+F）是全球自动化行业中久负盛名的专业传感器公司。倍加福作为全球自动化领域的电子传感与零部件的生产主导者，凭借不断的创新，恒久的质量保证，稳健的发展，保证了迄今六十余年的辉煌成就。倍加福在全球范围内拥有6300名员工，位于德国，美国，新加坡，匈牙利，印度尼西亚和越南的生产基地几乎全部通过了ISO9001的质量认证。