Alicia can row 6 miles downstream in the same time it takes her to row 4 miles upstream. she rows downstream 5 miles/hour faster than she rows upstream. find alicia's rowing rate each way. round your answers to the nearest tenth, if necessary.

Last year, laura had $30,000 to invest. she invested some of it in an account that paid 7% simple interest per year, and she invested the rest in an account that paid 8% simple interest per year. after one year, she received a total of $2230 in interest. how much did she invest in each account?