Avi and Bindu can complete a project in 4 and 12 hours, respectively. Avi begins the project at 5 a.m., and they work alternately for one hour each. When will the project be completed?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 11 a.m.
Avi can complete a project in 4 hours
Bindu can complete a project in 12 hours
Total work = L.C.M of (4, 12) = 12 units
Efficiency of Avi = 12/4 = 3 units
Efficiency of Bindu = 12/12 = 1 unit
Amount of work done in 2 hours = (3 + 1) = 4 units
12 units of work will be done in = 6 hours
The project will be completed = 5 a.m. + 6 hours = 11 a.m