a) 4:03 − 1:14 =
[R]

b) 5:21 − 2:18 =
[R]

c) 12:07 − 10:43 =
[R]

d) 7:11 − 3:38 =
[R]

e) 12:09 − 9:35 =
[R]

f) 8:34 − 5:20 =
[R]

g) 6:00 − 2:34 =
[R]

h) 9:11 − 7:33 =
[R]

i) 8:06 − 4:30 =
[R]

j) 6:33 − 5:17 =
[R]