a) 6:39 − 3:17 =
[R]

b) 11:00 − 7:24 =
[R]

c) 7:15 − 5:34 =
[R]

d) 4:04 − 1:30 =
[R]

e) 5:12 − 2:27 =
[R]

f) 5:31 − 2:01 =
[R]

g) 7:28 − 5:07 =
[R]

h) 8:04 − 6:54 =
[R]

i) 11:36 − 10:02 =
[R]

j) 3:02 − 1:54 =
[R]