a) 8:00 − 6:13 =
[R]

b) 6:04 − 3:50 =
[R]

c) 10:00 − 6:49 =
[R]

d) 9:00 − 5:38 =
[R]

e) 7:04 − 3:27 =
[R]

f) 11:40 − 8:11 =
[R]

g) 6:50 − 4:08 =
[R]

h) 9:22 − 6:14 =
[R]

i) 6:17 − 2:38 =
[R]

j) 11:23 − 9:33 =
[R]