alleryA can do a job in 8 days, B in 12 days. How long do A and B take working together?
A$10$ days
B$6$ days
C$4.8$ days
D$3.6$ days
Answer & Solution
Correct answer: C. $4.8$ days
Combined rate = 1/8 + 1/12 = 3/24 + 2/24 = 5/24. Time = 24/5 = 4.8 days.
*Shortcut: AB/(A+B) = 96/20 = 4.8.*
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