Hexaware Company Numerical Ability Time and Work

Two men and three women working 7 hours a day finish a work in 5 days. Four men and four women working 3 hours a day complete the work in 7 days. The number of days in which only 7 men working 4 hours a day will finish the work is?
A)10 B)5 C)7 D)6

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Hexaware Other Question

A and B can do a piece of work in 8 days. B and C can do it in 12 days and A and C in 16 days. Working together they will complete the work in how many days?
A)9.48 days B)12.2 days C)14.76 days D)7.38 days
Using all the letters of the word 'NOKIA' how many words can be formed, which begin with N and end with A?
A)6 B)18 C)12 D)24