A. Perform the indicated operations. Express the answer in its lowest terms. ADDITION
1.3/4 +6/8
2.3/9 + 6/9
3. 4/16 + 2 1/16
4. 1 7/10 +2 2/5
5. 3 2/7 + 4 3/4
SUBTRACTION
6. 5/11 - 3/11
7. 12/21 - 7/21
8. 5/6- 2/3
9. 4 1/2 - 1 3/4
10.4 1/4 - 2 3/8

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