Question 206889
This question has been answered many times before. Check out this <a href="http://www.algebra.com/algebra/homework/word/travel/Travel_Word_Problems.faq.question.22995.html">previous solution</a> or this other <a href="http://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.82070.html">previous solution</a>.