A can complete 1/3 * rd of a work in 5 days. So A completes the work in 5 * 1 / 1 / 3 = 15days In one day A completes 1/15 * th part of work. B can complete 2/5 th part of a work in 10 days. So B completes the work in 10 * 1 / 2 / 5 = 50/2 = 25 days. In 1 day B completes 1/25th part. Both A & B complete jointly 1/15 + 1/25 = 8/75 th part of work. Now, to complete the work they jointly will take 75/8 days = 9 days 9 hours.
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Answer:
A can complete 1/3 * rd of a work in 5 days. So A completes the work in 5 * 1 / 1 / 3 = 15days In one day A completes 1/15 * th part of work. B can complete 2/5 th part of a work in 10 days. So B completes the work in 10 * 1 / 2 / 5 = 50/2 = 25 days. In 1 day B completes 1/25th part. Both A & B complete jointly 1/15 + 1/25 = 8/75 th part of work. Now, to complete the work they jointly will take 75/8 days = 9 days 9 hours.
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