Answer:

1.4/1 - 3/5

= 20/5 - 3/5

= 17/5

= 3.4

=17/5 or 3 2/5

2.3/1 - 5/6

= 18/6 - 5/6

= 13/6

= 2.1666666667

=13/6 or 2 1/6

3.5/1 - 2/3

= 15/3 - 2/3

= 13/3

= 4.3333333333

=13/3 or 4 1/3

4.6/1 - 1/4

= 24/4 - 1/4

= 23/4

= 5.75

= 23/4 or 5 3/4

5.2/1 - 4/5

= 10/5 - 4/5

= 6/5

= 1.2

=6/5 or 1 1/5

1.12/12 - 5/12

= 12/12 - 5/12

= 7/12

= 0.58333333333

=7/12

2.2/1 - 2/8

= 16/8 - 2/8

= 14/8

= 7/4

= 1.75

= 7/4 or 1 3/4

3.5/8 + 3/8

= 5/8 + 3/8

= 8/8

= 1/1

= 1 km

4.2/1 - 7/8

= 16/8 - 7/8

= 9/8

= 1.125

9/8 or 1 1/8

5.3/1 - 3/4

= 12/4 - 3/4

= 9/4

= 2.25

=9/4 or 2 1/4