a) 3:25 − 2:23 =
[R]

b) 6:09 − 4:16 =
[R]

c) 4:11 − 1:14 =
[R]

d) 8:02 − 6:54 =
[R]

e) 8:08 − 4:18 =
[R]

f) 12:33 − 10:15 =
[R]

g) 8:06 − 6:48 =
[R]

h) 10:33 − 8:10 =
[R]

i) 11:28 − 10:24 =
[R]

j) 12:14 − 9:15 =
[R]