Question

Add 20 hrs 43 min 50 sec +4 hts 17 min 50 sec​

Answer 1

conventing all vaues into sec then we get

20hrs=20×60×60=72000sec

43min=43×60=2580

50sec

adding all these we get

72000+2580+50=74630.......1

now 4hrs=4×60×60=14400

17min=17×60=1020sec

50sec

adding all these

14400+1020+50=15470........2

adding 1 and 2

74630+15470=90100sec