(a) 1 min 20s + 2 min 50s
= 4 min 10 sec.
(b) 8 min - 3 min 20s
= 4 min 40 sec.
(c) 1 min 28s + 100s + 132s
= 3 min. 40 sec.
(d) 515s - 3 min 25s
= 5 min 10 sec.
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Answers & Comments
(a) 1 min 20s + 2 min 50s
= 4 min 10 sec.
(b) 8 min - 3 min 20s
= 4 min 40 sec.
(c) 1 min 28s + 100s + 132s
= 3 min. 40 sec.
(d) 515s - 3 min 25s
= 5 min 10 sec.