a) 3:13 − 1:39 =
[R]

b) 4:37 − 2:04 =
[R]

c) 8:54 − 7:00 =
[R]

d) 3:26 − 1:09 =
[R]

e) 5:17 − 2:05 =
[R]

f) 6:08 − 4:03 =
[R]

g) 6:14 − 2:42 =
[R]

h) 5:13 − 4:13 =
[R]

i) 4:13 − 2:06 =
[R]

j) 8:08 − 5:49 =
[R]