a) 11:10 − 9:20 =
[R]

b) 3:28 − 1:21 =
[R]

c) 9:17 − 6:15 =
[R]

d) 4:24 − 2:34 =
[R]

e) 11:16 − 10:08 =
[R]

f) 8:23 − 5:21 =
[R]

g) 10:21 − 7:06 =
[R]

h) 6:06 − 4:16 =
[R]

i) 8:04 − 4:45 =
[R]

j) 6:13 − 4:05 =
[R]