a) 4:31 − 3:13 =
[R]

b) 11:14 − 9:29 =
[R]

c) 5:35 − 4:05 =
[R]

d) 12:15 − 9:22 =
[R]

e) 6:05 − 3:34 =
[R]

f) 11:02 − 8:12 =
[R]

g) 10:24 − 9:06 =
[R]

h) 5:34 − 2:14 =
[R]

i) 8:18 − 6:16 =
[R]

j) 3:18 − 1:22 =
[R]