a) 4:20 − 3:05 =
[R]

b) 5:10 − 1:14 =
[R]

c) 4:01 − 2:21 =
[R]

d) 6:23 − 4:01 =
[R]

e) 10:10 − 8:45 =
[R]

f) 10:31 − 8:27 =
[R]

g) 4:17 − 1:36 =
[R]

h) 12:09 − 8:29 =
[R]

i) 7:04 − 4:31 =
[R]

j) 11:05 − 9:33 =
[R]