a) 10:39 − 8:18 =
[R]

b) 12:30 − 9:23 =
[R]

c) 12:07 − 9:45 =
[R]

d) 10:11 − 7:36 =
[R]

e) 10:00 − 8:04 =
[R]

f) 4:01 − 2:37 =
[R]

g) 11:06 − 9:30 =
[R]

h) 12:18 − 10:30 =
[R]

i) 7:01 − 3:31 =
[R]

j) 5:01 − 1:11 =
[R]