How many time zones are there in the U.S.?
6
3
3
3
4
5
3
4
5
3
4
2
5
3
4
2
5
3
4
2
5
3
4
2
5
3
4
2
5
3
4
6
2
5
3
4
6
2
5
3
4
6
2
5
3
4
6
2
5
7
3
4
6
2
5
7
3
4
6
2
1
5
7
3
4
6
2
0
1
5
7
3
4
6
2
1
5
0
8
7
3
4
6
2
1
5
8
7
3
0
4
6
2
1
5
8
7
3
4
6
2
0
1
5
8
7
4
6
2
1
5
0
8
9
7
4
6
2
1
5
8
9
7
0
6
2
1
8
9
7
11
6
2
1
8
9
7
11
6
1
8
9
7
11
12
6
10
1
8
9
7
11
12
6
10
1
8
9
7
11
12
6
10
1
8
9
7
11
12
6
10
1
8
9
7
11
13
12
10
1
8
9
7
11
13
12
10
1
8
24
9
7
11
13
12
365
59
365
59
365
59