a) 7:33 − 4:20 =
[R]

b) 7:17 − 4:16 =
[R]

c) 11:10 − 10:07 =
[R]

d) 7:24 − 5:14 =
[R]

e) 6:21 − 2:36 =
[R]

f) 5:38 − 4:18 =
[R]

g) 5:46 − 3:12 =
[R]

h) 3:06 − 1:36 =
[R]

i) 8:32 − 5:16 =
[R]

j) 12:16 − 8:28 =
[R]