a) 6:09 − 2:24 =
[R]

b) 12:26 − 10:07 =
[R]

c) 5:36 − 2:23 =
[R]

d) 9:13 − 5:46 =
[R]

e) 4:27 − 3:26 =
[R]

f) 12:09 − 8:15 =
[R]

g) 7:30 − 6:11 =
[R]

h) 12:06 − 10:05 =
[R]

i) 11:16 − 9:39 =
[R]

j) 7:32 − 6:11 =
[R]