A and B takes 6 hours and 9 hours respectively to complete a work.
A works for 1 hour and then B takes works for 2 hours.
(i) how much work is done in these 3 hours
(ii) how much work is still left ?
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B in 1 hour does 1/9 part of work. B work for 2 hours== 2*1/9 =2/9 part of work completed. So, in 3 hours== 1/6 + 2/9 = 3+4/18 = 7/18 work is completed.
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