First day: 30 mins
Second day: 40 mins
Third day: 50 mins
Fourth day: 60 mins
Fifth day : 70 mins
Sixth day : 80 mins
Seventh day : 90 mins
Eighth day : 100 mins
Ninth day : 110 mins
Tenth day : 120 mins
Your answer would be : B
9.5m questions
12.2m answers