a) 6:24 − 5:04 =
[R]

b) 4:11 − 1:44 =
[R]

c) 11:11 − 10:11 =
[R]

d) 11:10 − 8:33 =
[R]

e) 10:37 − 9:18 =
[R]

f) 9:22 − 6:26 =
[R]

g) 8:15 − 5:08 =
[R]

h) 12:10 − 10:29 =
[R]

i) 6:38 − 3:07 =
[R]

j) 5:24 − 3:32 =
[R]