How many time zones are there in the U.S.?
6
3
3
3
3
3
3
9
3
2
9
3
2
9
3
2
7
9
3
2
7
9
3
2
7
4
9
3
2
7
4
9
3
2
6
7
4
9
3
2
6
7
5
4
9
3
2
6
7
5
4
9
3
2
6
7
5
4
8
9
3
2
6
7
5
4
8
9
3
2
6
7
5
4
8
9
3
2
6
7
5
4
8
9
3
2
6
7
5
4
8
9
1
2
6
7
5
4
8
9
1
2
6
7
5
4
8
9
1
2
6
7
5
4
8
9
11
1
2
6
7
5
4
8
9
11
1
2
6
7
14
5
4
8
9
11
1
2
6
7
14
5
4
12
8
11
1
6
7
14
5
4
12
8
11
10
1
6
7
14
5
4
12
8
11
10
1
6
14
5
4
12
8
11
10
1
6
14
5
4
12
8
11
10
1
6
14
5
12
8
11
10
1
6
14
5
12
8
11
10
1