a) 2:37 − 1:06 =
[R]

b) 11:02 − 7:53 =
[R]

c) 10:15 − 8:31 =
[R]

d) 9:47 − 7:03 =
[R]

e) 8:03 − 5:26 =
[R]

f) 4:33 − 1:16 =
[R]

g) 10:18 − 7:05 =
[R]

h) 8:23 − 6:28 =
[R]

i) 12:41 − 10:03 =
[R]

j) 7:51 − 5:00 =
[R]