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.