a) 6:08 − 4:18 =
[R]

b) 2:43 − 1:06 =
[R]

c) 7:19 − 3:38 =
[R]

d) 8:33 − 7:18 =
[R]

e) 10:36 − 8:04 =
[R]

f) 3:43 − 2:05 =
[R]

g) 6:05 − 2:19 =
[R]

h) 9:55 − 7:00 =
[R]

i) 5:01 − 4:01 =
[R]

j) 10:15 − 7:19 =
[R]