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Subtract 4 hours 20 minutes 36 seconds from 8 hours 18 minutes 20 seconds.
Given :
The given terms are 4 hours 20 minutes 36 seconds and 8 hours 18 minutes 20 seconds.
To do :
We have to subtract 4 hours 20 minutes 36 seconds from 8 hours 18 minutes 20 seconds.
Solution :
$8 hr 18 min 20 sec - 4 hr 20 min 36 sec = 7 hr (60+18-1) min (60+20) sec -4 hr 20 min 36 sec $
$ = 7 hr 77 min 80 sec - 4 hr 20 min 36 sec$
$= (7-4) hr (77-20) min (80-36) sec$
$= 3 hr 57 min 44 sec$.
Therefore, the difference between 4 hours 20 minutes 36 seconds from 8 hours 18 minutes 20 seconds is 3 hours 57 minutes 44 seconds.