a) 9:05 − 7:39 =
[R]

b) 4:20 − 3:12 =
[R]

c) 10:20 − 8:18 =
[R]

d) 4:22 − 1:14 =
[R]

e) 3:38 − 2:07 =
[R]

f) 9:06 − 5:18 =
[R]

g) 6:46 − 5:04 =
[R]

h) 8:36 − 5:04 =
[R]

i) 8:05 − 7:05 =
[R]

j) 12:09 − 10:26 =
[R]