a car starting from rest is accelerated to uniformly to a velocity of 1oo.2km/h,a break is applied in 4seconds,find it acceleration converting from km/h to m/s

pls i need the answer now pls

100.2 km/hr * 1000m/km * 1hr/3600s = 27.83 m/s

assuming it accelerated during those 4 seconds, then
a = (27.83 m/s) / 4s = 6.958 m/s^2