Dear Sir
I would be grateful if you can help me to solve the the below questions
I managed to get the answer to part (a) but cannot get the time 11.16 minutes in part b

Dear Sir
I would be grateful if you can help me to solve the the below questions
I managed to get the answer to part (a) but cannot get the time 11.16 minutes in part b

thanks
Kingsman

I

This is a seperable differential equation with solution: