a) 5:11 − 3:07 =
[R]

b) 4:34 − 3:16 =
[R]

c) 6:37 − 3:12 =
[R]

d) 10:19 − 7:07 =
[R]

e) 5:23 − 3:15 =
[R]

f) 6:27 − 5:02 =
[R]

g) 8:32 − 6:19 =
[R]

h) 10:39 − 7:11 =
[R]

i) 12:09 − 9:28 =
[R]

j) 3:12 − 1:47 =
[R]