a) 3:24 − 2:07 =
[R]

b) 6:33 − 4:01 =
[R]

c) 5:48 − 2:00 =
[R]

d) 8:23 − 6:36 =
[R]

e) 11:23 − 8:35 =
[R]

f) 8:30 − 7:11 =
[R]

g) 12:01 − 9:29 =
[R]

h) 9:06 − 5:19 =
[R]

i) 11:04 − 8:07 =
[R]

j) 11:22 − 10:16 =
[R]