a) 6:03 − 2:08 =
[R]

b) 6:51 − 4:00 =
[R]

c) 8:07 − 5:03 =
[R]

d) 10:05 − 8:52 =
[R]

e) 5:17 − 3:06 =
[R]

f) 12:17 − 9:32 =
[R]

g) 9:04 − 7:37 =
[R]

h) 7:36 − 4:15 =
[R]

i) 8:02 − 4:31 =
[R]

j) 5:18 − 1:22 =
[R]