AM

12:00

1:05

2:11

3:16

4:22

5:27

6:33

7:38

8:44

9:49

10:55

PM

12:00

1:05

2:11

3:16

4:22

5:27

6:33

7:38

8:44

9:49

10:55

1 goes back (3 minutes)

5 and 10 go across (13 minutes)

2 goes back (15 minutes)

1 and 2 cross (17 minutes) – and everyone safe and sound ]]>

Here is one way to count the possibilities: place all four red beads. There are now four gaps in which

we can place the yellow beads. 1) Place one in each gap. 2) Place all four in one gap. 3 & 4) Place

one in one gap and three in another – either adjacent or opposite. 5 & 6) Place two in each of two

gaps – either opposite or adjacent. 7 & 8) Place two in one gap and one in each of two other

gaps. The two and the empty gap can be either opposite or adjacent. ]]>