How many rivers in the world are longer than the Mississippi River?
3
2
2
2
2
1
2
1
2
1
3
2
1
3
2
1
3
2
1
3
2
1
4
3
2
1
4
0
3
2
1
4
3
2
1
0
4
3
2
1
4
0
3
2
1
4
5
0
3
2
1
4
5
3
2
1
0
4
5
3
2
1
4
5
0
3
2
1
4
5
0
3
2
1
4
5
6
3
1
0
4
5
6
3
1
4
5
0
6
3
7
1
4
5
6
0
3
7
4
5
6
3
7
0
4
5
8
6
3
7
4
5
8
0
6
7
4
5
8
6
0
7
4
5
8
6
7
0
4
9
5
8
6
7
9
5
8
0
6
7
9
5
8
6
10
7
9
5
8
6
10
7
9
5
8
13
6
10
7
9
5
8
13
6
10
7
9
8
11
13
6
10
7
9
8
11
13
6
10
7
9
8
11
13
6
10
7
9
8
11
13
6
10
7
9
8
11
13
265
229
265