Joseph and chandra are cleaning their house which has 12 rooms, each about the same size. if joseph cleans them by himself, it takes him 6 hours. if chandra cleans them by herself, it takes her 12 hours. if they both clean the house, they will finish in 4 hours. if they work together, how many rooms will chandra clean and how many will joseph clean?

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step-by-step explanation:

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %