a) 4:35 − 2:02 =
[R]

b) 6:18 − 2:27 =
[R]

c) 6:35 − 3:09 =
[R]

d) 4:25 − 3:07 =
[R]

e) 12:10 − 11:02 =
[R]

f) 11:31 − 8:28 =
[R]

g) 4:12 − 3:01 =
[R]

h) 8:05 − 4:30 =
[R]

i) 5:38 − 2:20 =
[R]

j) 10:43 − 7:01 =
[R]