Which expression is equivalent to 298−−√⋅2√?

Can someone answer these problems for me

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers