Traveling at 65 miles per hour, approximately how long will it take for marcus to drive 310 miles

Ineed if you could explain and give me the answer you! this needs done

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project