a) 7:16 − 4:11 =
[R]

b) 4:45 − 2:13 =
[R]

c) 2:38 − 1:17 =
[R]

d) 9:27 − 8:25 =
[R]

e) 3:53 − 2:02 =
[R]

f) 11:30 − 10:06 =
[R]

g) 10:17 − 9:03 =
[R]

h) 2:16 − 1:15 =
[R]

i) 6:45 − 5:11 =
[R]

j) 7:18 − 3:37 =
[R]