a) 12:02 − 9:10 =
[R]

b) 6:13 − 4:46 =
[R]

c) 10:10 − 6:39 =
[R]

d) 10:15 − 8:34 =
[R]

e) 9:12 − 6:34 =
[R]

f) 5:25 − 3:34 =
[R]

g) 7:15 − 4:25 =
[R]

h) 3:49 − 1:07 =
[R]

i) 8:08 − 5:32 =
[R]

j) 8:05 − 6:33 =
[R]