a) 5:13 − 2:46 =
[R]

b) 10:03 − 8:23 =
[R]

c) 8:09 − 6:32 =
[R]

d) 5:17 − 2:18 =
[R]

e) 6:34 − 3:15 =
[R]

f) 5:02 − 1:20 =
[R]

g) 6:30 − 5:21 =
[R]

h) 7:12 − 3:42 =
[R]

i) 10:02 − 8:27 =
[R]

j) 8:44 − 6:03 =
[R]