a) 4:49 − 2:07 =
[R]

b) 2:33 − 1:26 =
[R]

c) 12:10 − 8:40 =
[R]

d) 5:13 − 4:08 =
[R]

e) 8:01 − 4:09 =
[R]

f) 7:18 − 5:18 =
[R]

g) 7:22 − 6:16 =
[R]

h) 8:22 − 5:22 =
[R]

i) 5:20 − 4:18 =
[R]

j) 10:36 − 8:09 =
[R]