a) 5:06 − 3:47 =
[R]

b) 12:18 − 9:06 =
[R]

c) 10:09 − 6:30 =
[R]

d) 7:31 − 6:04 =
[R]

e) 3:26 − 1:11 =
[R]

f) 7:20 − 6:05 =
[R]

g) 6:34 − 3:18 =
[R]

h) 4:10 − 1:14 =
[R]

i) 8:10 − 6:20 =
[R]

j) 4:25 − 2:10 =
[R]