Wipro Company Numerical Ability Time and Work

Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long it take both A & B, working together but independently, to do the same job?

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Wipro Other Question
If 5 women or 8 girls can do a work in 84 days. In how many days can 10 women and 5 girls can do the same work? A can finish a work in 18 days and B can do the same work in half the time taken by A. Then, working together, what part of the same work they can finish in a day?