There are 2 exit doors in a theater. If only door A is opened, the theater will be empty in 9 minutes. And if only door B is opened, the theater will be empty in 6 minutes. If door A and door B are opened together, then the theater will be empty in ... seconds. A. 900 C. 216 D. 60 B. 252
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Jawab:
Theater will be empty in C. 216 seconds.
Penjelasan dengan langkah-langkah:
Theater will be empty if 2 doors are open = 1/( 1/9+1/6 ) x 60 seconds
= 1/( 15/54 ) x 60 seconds
= 54/15 x 60 seconds
= 54 x 4 seconds
= 216 seconds
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