alleryA, B, C complete jobs alone in 10, 12, 15 days. Working together, they finish in:
A$4$ days
B$5$ days
C$6$ days
D$8$ days
Answer & Solution
Correct answer: A. $4$ days
LCM(10,12,15)=60. Rates: 6, 5, 4. Combined = 15 units/day. Time = 60/15 = 4 days.
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