I think you see those symbols only when you post a reply, then the message is correct when you watch the thread normally!
My Japanese is still pretty bad, but I will try to help you...
Your sentence
バス で いきます。それから とほ で 二十ぷん ぐらい です
My sentence
バス で い
って 二十ぷん ぐらい
あるきます。
I didn't know the word とほ...
I think that using the verb あるく (to walk) can make things easier, if you want to say for how much time you walk!
And I would connect the two sentences putting the first verb in the te form. It sounds more natural, I think. With そして you add something that pops up to your mind, I think.
But you know perfectly what is the routine to go to だいがく...
Please correct me, if I said anything wrong.