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A and B take 6hours and 9hours respectively to complete the work. A works 1hour and then B works 2hoursHow much work is done in these 3 hours . How much work is still left |
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Answer» ✪ Question :- A and B TAKE 6hours and 9 hours respectively to complete the work. A works 1HOUR and then B works 2 hours . How much work is done in these 3 hours . How much work is still left ? ✰ Solution :- Given that , A can complete the work in = 6 hours. That means, A can do = (1/6) unit of work per HOUR. Also, B A can complete the work in = 9 hours. That means, B can do = (1/9) unit of work per hour. Than , B will do work in 2 hours = 2 * (1/9) = 2/9 unit of work. So, Total work done by A + B in 3 hours = (1/6) + (2/9) → (3+4)/18 → (7/18) unit of work done. Now, work left to be done = 1 - (7/18) = (11/18) unit of work. |
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