2. 17 min as follows:

bloor (bloor)
Mark the four people as A(1), B(2), C(5), D(10)
1) A(1) & B(2) ----> 2 min
2) A(1) <------ 1 min
3) C(5) & D(10) -----> 10 min
4) B(2) <---- 2 min
5) A(1) & B(2) ----> 2 min
totally 17 min
(#48333@0)
2001-4-18 -05:00

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