Correct option is A
X = 144 days
Y = 240 days
Z = 320 days
1 day work
= 1/144 + 1/240 + 1/320
LCM = 2880
= (20 + 12 + 9) / 2880
= 41 / 2880
Time required
= 2880 / 41
= 70(10/41) days
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Question
X can finish a work in 144 days, Y can finish a work in 240 and Z can finish the same piece of work 320 days. If X, Y and Z are working together to complete a work, how many days will they require to complete the work?
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