a can do a piece of work in 4 hours and b can do a piece of work in 6 hours. how much time would they take working together. if they want to complete 15 pieces of same work . how much time would they take
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Let Total Work = LCM(2,3,4) = 12 units.
A does 12/4= 3 units per hour.
A + C complete 12/2 = 6 units per hour.
=> C complete 6 - 3 = 3 units per hour.
B + C complete 12/3 = 4 units per hour.
=> B complete 4 - 3 = 1 unit per hour.
=> B alone can complete work in 12/1 = 12 hours
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