a) 6:03 − 2:55 =
[R]

b) 6:15 − 2:19 =
[R]

c) 4:32 − 3:08 =
[R]

d) 5:14 − 1:31 =
[R]

e) 3:53 − 1:03 =
[R]

f) 8:16 − 4:20 =
[R]

g) 8:10 − 5:03 =
[R]

h) 8:20 − 6:10 =
[R]

i) 4:43 − 2:06 =
[R]

j) 6:02 − 4:41 =
[R]