7 . A can do of a piece of work in 14 days 10 and with the help of B he is able to finish the same work in 10 days. What time will B alone take to finish the work ?
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A completes 7/10 of a work in 14 days, means A's daily performance is...7/10 divided by 14 = 1/20 part of the work or A can complete the work in 20 days.After 14 days the unfinished work left is...1 - 7/10 = 3/10 part and A and B jointly completed this part in 2 days.A had contributed 1/20 x 2 = 2/20 or 1/10 part and B's contribution is... The rest i.e..3/10 - 1/10 =2/10 in 2 days or B's daily contribution is 1/10 part of the work. Therefore B Alone could have completed the work in...10 days. Answer.
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