Amodel plane is 3 cm long. if it was built with a scale of 1 cm : 4 m, then how long is the real plane?

The real plane is 12 meters long. Because the ratio is 1cm:4m so times three the ratio is 3cm:12m long

i not know

step-by-step explanation:

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