A crew will arrive in one week and begin filming a city for a movie. The mayor is desperate to clean the city streets before filming begins. Two teams are available, one that requires 300 hours and one that requires 400 hours. If the teams work together, how long will it take to clean all of the streets? Is this enough time before the cameras begin rolling?

It will take ___ hours to clean the streets. (Type an integer or fraction rounded to the nearest tenth.)