a) 6:07 − 2:28 =
[R]

b) 6:26 − 5:06 =
[R]

c) 9:01 − 6:40 =
[R]

d) 9:09 − 6:47 =
[R]

e) 10:04 − 7:38 =
[R]

f) 5:21 − 1:34 =
[R]

g) 10:04 − 6:21 =
[R]

h) 12:14 − 8:20 =
[R]

i) 4:08 − 1:01 =
[R]

j) 9:48 − 7:03 =
[R]