alleryA finishes a job in 6 days, B in 4 days. Using the LCM trick (work = 12 units), what is B's daily rate?
A$2$ units per day
B$3$ units per day
C$4$ units per day
D$6$ units per day
Answer & Solution
Correct answer: B. $3$ units per day
Work = LCM(6,4) = 12. B's rate = 12/4 = 3 units/day.
A's rate = 12/6 = 2 units/day. Together 5 units/day.
Time together = 12/5 = 2.4 days.
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