Convert into second 28' 40"

Yes, The comment above mines is correct the answer is 1,720.

Take the minutes part times 60.
Then add the seconds part.
28*60 + 40 = 1,720 seconds

A second is the base unit of time. Originally, it was based on the length of the day, but it has since been standardized based on the radiation wavelength of caesium-133.

If you divide 0.1 and 0.6 you wii get 0.166666 which rounds to .167 which is answer b