a) 10:00 − 8:50 =
[R]

b) 2:26 − 1:17 =
[R]

c) 3:29 − 1:06 =
[R]

d) 11:46 − 8:06 =
[R]

e) 8:01 − 6:42 =
[R]

f) 11:28 − 10:19 =
[R]

g) 12:07 − 10:36 =
[R]

h) 5:39 − 3:11 =
[R]

i) 4:04 − 1:22 =
[R]

j) 9:10 − 5:49 =
[R]