Question

35 mins 30 secs plus 13 minutes 50 secs​

Answer 1

35 mins 30 secs + 13 minutes 50 secs​

= (35 mins + 13 mins) + (30 + 50)

= 48 mins + 80 seconds

But, a minute has 60 seconds only so..

= 49 mins + 20 seconds