Question
Two people, A and B, working separately can sanitize a
building in 6 and 10 hours, respectively. They work in stretches of one hour alternately. If A begins at 8 a.m., then when will the work be finished?Solution
A                          B 6                          10               30                        (Total work) 5                           3            -Efficiency Working fashion ® (A, B, A, B.) 2 hours ® 8 units  6 hours ® 24 units 7 hours ® 29 units 8 hours ® 1/ 3 hours ® 30 units Total time ® 22/3 hours  Þ Work will finish.
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