Infosys Company Numerical Ability Time and Work

Person A can complete the job in 10 days, Person B can complete the job in20 days. If both together work then in how many days they will finish d work ?

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Infosys Other Question

If the list price of a book is reduced by Rs. 5, then a person can buy 5 more books for Rs. 300. The original cost of the book is
(1) Rs. 15
(2) Rs. 20
(3) Rs. 25
(4) Rs. 30
There are 4 women having walking speed as 1min, 2min, 4min, 5min. If one or two women can cross bridge at a time with flashlight, then what is min. time required for 4 women to cross bridge without using flashlight?