a) 7:35 − 6:11 =
[R]

b) 7:09 − 6:09 =
[R]

c) 12:31 − 10:18 =
[R]

d) 12:16 − 10:40 =
[R]

e) 7:05 − 4:19 =
[R]

f) 3:13 − 2:09 =
[R]

g) 8:22 − 5:37 =
[R]

h) 10:21 − 7:26 =
[R]

i) 6:16 − 4:09 =
[R]

j) 2:17 − 1:10 =
[R]