Need help ASAP please and thank you

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value