In one week 97 cell phones were sold. the following week, 48 more cell phones were sold than the week before. how many cell phones were sold in those 2 weeks

145. 7 + 8 is 15 carry the 1, 9+4+1 is 14, so 145

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m