Question

Add 67 h 59 min 58 sec, 3 h 9 min 6 sec.
a. 72 h 8 min 4 sec
b. 72 h 9 min 4 sec
c. 71 h 9 min 4 sec
d) none of these​

Answer 1

67 h 59 min 58 sec

+. 3. h 9 min. 6. sec

71 h 9 min 4 sec

So the answer is 71 h 9 min and 4 sec