1. The problem statement, all variables and given/known data The question is: Mr Snail learns 1 fact/day. When will he know as much as the hare? 2. Relevant equations The hare's learning rate is given by the equation: Learning Rate=50(e^((15-t)/5))+100 Where t is the time in days. 3. The attempt at a solution Basically I have tried to make the equation equal to t, so that the total facts known will be the same as the amount of days passed, which is what I need. But I'm stuck? What I have so far is: t=50(e^((15-t)/5))+100 t-100=50(e^((15-t)/5)) (t/50)-2=e^((15-t)/5) ln((t/50)-2)=ln(e^((15-t)/5)) ln((t/50)-2)=(15-t)/5 ln((t/50)-2)=3-(t/5) And I have no idea of how to solve the equation from there?