Use solve to determine for a person whose mass is 65 kg how

Question

Biomedical engineers are developing an insulin pump for diabetics. To do this, it is important to understand how insulin is cleared from the body after a meal. The concentration of insulin at any time t is described by the equation

C = C₀ e^-30t/m

where C₀ is the initial concentration of insulin, t is the time in minutes, and m is the mass of the person in kilograms. Use solve to determine for a person whose mass is 65 kg how long it will take an initial concentration of 90 to reduce to 10. Use double to get your result in minutes.