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Re: Three surgeons - Anna, Claire, and Diane - are asked to perform an eme [#permalink]
Ra = 1/8 ; Rc ; 1/10 Rd ; 1/10
LCM ; 120
together they work for 2 hours ; (15+12+10/120 ) *2 ; 37/60
left with 23 /60 units work
which A & C do for 1 hour ; 1/8+1/10 ; 9/40
left work ; 23/60-9/40 ; 38/240
now A will finish this work in
1/8* x = 38*60/ 240
x= 76 mins
OPTION E


Bunuel wrote:
Three surgeons - Anna, Claire, and Diane - are asked to perform an emergency appendectomy. Working alone, Anna could complete the operation in 8 hours. Claire could do the job in 10 hours, while it would take Diane 12 hours by herself. On this particular shift, all three of the surgeons worked together on the appendectomy for two hours. At that point, Diane left to answer a page and never returned. An hour later, Claire left to handle another emergency - she also never returned. How long (in minutes) did it take Anna to complete the appendectomy, after
Claire and Diane both left?

A. 56
B. 60
C. 66
D. 70
E. 76
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Re: Three surgeons - Anna, Claire, and Diane - are asked to perform an eme [#permalink]
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Re: Three surgeons - Anna, Claire, and Diane - are asked to perform an eme [#permalink]
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