A can do a job in 20 days and B in 30 days. Together they finish in: (AFCAT PYQ)
A10 days
B12 days
C15 days
D25 days
Question 2
A and B together finish in 12 days. B alone takes 20 days. A alone takes: (AFCAT PYQ)
A24 days
B28 days
C30 days
D32 days
Question 3
A pipe fills a tank in 6 hours; another empties it in 9 hours. Time to fill if both open: (AFCAT PYQ)
A15 hours
B18 hours
C12 hours
D9 hours
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