a) 7:30 − 6:18 =
[R]

b) 10:28 − 7:12 =
[R]

c) 6:12 − 2:23 =
[R]

d) 12:09 − 8:30 =
[R]

e) 8:07 − 6:44 =
[R]

f) 9:05 − 6:39 =
[R]

g) 3:12 − 1:17 =
[R]

h) 3:30 − 1:26 =
[R]

i) 6:18 − 4:25 =
[R]

j) 10:08 − 8:08 =
[R]