a) 8:15 − 4:27 =
[R]

b) 10:06 − 7:41 =
[R]

c) 5:09 − 1:44 =
[R]

d) 9:47 − 8:12 =
[R]

e) 8:43 − 7:12 =
[R]

f) 6:13 − 2:41 =
[R]

g) 7:16 − 4:20 =
[R]

h) 6:21 − 3:13 =
[R]

i) 10:13 − 8:22 =
[R]

j) 8:22 − 6:19 =
[R]