a) 12:20 − 8:34 =
[R]

b) 9:40 − 6:06 =
[R]

c) 12:27 − 9:05 =
[R]

d) 4:25 − 1:09 =
[R]

e) 12:24 − 10:06 =
[R]

f) 8:15 − 5:03 =
[R]

g) 2:20 − 1:08 =
[R]

h) 9:29 − 6:02 =
[R]

i) 4:18 − 1:27 =
[R]

j) 3:35 − 2:23 =
[R]