a) 5:21 − 4:07 =
[R]

b) 9:31 − 6:00 =
[R]

c) 10:22 − 7:25 =
[R]

d) 10:31 − 7:15 =
[R]

e) 6:50 − 4:00 =
[R]

f) 4:57 − 2:02 =
[R]

g) 9:00 − 7:11 =
[R]

h) 10:00 − 7:17 =
[R]

i) 12:11 − 8:38 =
[R]

j) 10:08 − 8:44 =
[R]