a) 6:10 − 2:38 =
[R]

b) 10:36 − 8:20 =
[R]

c) 12:48 − 10:05 =
[R]

d) 11:24 − 9:17 =
[R]

e) 11:10 − 8:41 =
[R]

f) 7:37 − 6:14 =
[R]

g) 2:39 − 1:07 =
[R]

h) 12:11 − 10:40 =
[R]

i) 7:02 − 4:28 =
[R]

j) 7:02 − 3:55 =
[R]