if a motorist had driven 1 hour longer on a certain day and at an anverage rate of 5 miles per hour faster, he would have covered 70 more miles than he actually did. How many more miles would he have covered than he actually did if had driven 2 hours longer and at an average rate of 10 miles per hour faster on that day?作者: rockstonexS 时间: 2011-8-30 20:45