Simplify the expression into a linear equation 1+2a-3(4+5a)+6 (7-8a)

SOLVING STEPS

Now it will be

And

Now it's

Now Calculate this

1 - 12 + 42

Now it's

Now Calculate this too

Now the ANSWER is

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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