a) 6:02 − 4:13 =
[R]

b) 5:35 − 4:18 =
[R]

c) 4:13 − 1:11 =
[R]

d) 11:01 − 7:32 =
[R]

e) 8:24 − 5:23 =
[R]

f) 5:11 − 3:41 =
[R]

g) 10:10 − 8:34 =
[R]

h) 10:35 − 9:15 =
[R]

i) 8:24 − 6:33 =
[R]

j) 6:08 − 2:39 =
[R]