Question

subtract 6 min 40 sec from 10 min 30 sec

Answer 1

6 × 60 = 360
10 × 60 = 600
360+40 - 600+30
= 400 - 680
=. 280seconds

Answer 2

Firstly we convert them into Seconds for easy calculations
6 min 40s =6*60 + 40 seconds=400 seconds.
Also, 10 min 30 s=10*60 + 30=630 seconds
Subtracting,630-400=230 seconds
When 230 is divided with 60 its quotient is 3 and remainder 50
i.e Result=3 min and 50 seconds

Hope it Helped :)