a) 6:08 − 2:34 =
[R]

b) 9:38 − 6:04 =
[R]

c) 12:13 − 8:24 =
[R]

d) 11:01 − 8:19 =
[R]

e) 8:07 − 4:35 =
[R]

f) 7:00 − 4:01 =
[R]

g) 4:16 − 3:04 =
[R]

h) 11:26 − 9:13 =
[R]

i) 12:08 − 8:48 =
[R]

j) 4:26 − 1:07 =
[R]