MBA Exam

There is a work to be done by three friends A,B,C Three of them take 5 hours less than A alone would have taken.one third that B alone would have taken and two ninths of the time C alone would have taken.How long does it take for the three of them to finish the work?

1) 3 hours
2) 4 hours
3) 5 hours
4) none of these

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MBA Other Question

4 men and 3 women finish a job in 6 days, and 5 men and 7 women can do the same job in 4 days. How long will 1 man and 1 woman take to do the work?

1) 22(2/7) days
2) 25(1/2) days
3) 5(1/7) days
4) 12(7/22) days
F(x) is a cubic polynomial and the coefficients of F(x) are rational. If the graph of F(x) touches the x-axis, then how many rational roots does F(x) = 0 have?

1) 0
2) 1
3) 2
4) 3