15:35
divide both sides by 5 if you need it in simplest form
3:7
Mondays and Thursdays is only 2 days a week. So 2.15x2 is 4.3 hours a week. 4.3x3= 12.9 hours every 3 weeks or 12 hours and 54 minutes
It was first detected by Robert Wilson and Arno Penzias.
