anupamadw wrote:
Hi Bunuel
Ccould you please clarify one thing?
It is given that both chefs started working together, so do we have to consider work done by Bonnie in 2 hrs?
Thanks
Anupama
Hi.
I also have another explanation.
1. I understand this wording as "working together, chef Andrew alone contributed to 1/4 of the work done"
By this mean, chef Bonnie made up the rest 3/4.
So, we can conclude the working rate of A/B is 1/3
2. It takes 6 hrs for chef Bonnie to finish work alone => not suff.
(1+2) => we can deduce that chef Andrew would take 3x6 = 18 hours to finish work alone.
So, together they should need only (1/18 + 1/6)= 4.5 hours to get things done.
However, as chef Andrew left only after 2 hrs, so there is (1 - 2/4.5) = 5/9 work not yet finished.
So, chef Bonnie would cover 5/9 work in (5/9)x(6)=10/3 hours.
So, C is the answer.
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