Nadeen bought a magazine for $7.50 and two sandwiches that cost the same price. She spent a total of $20. How much did each sandwich cost?

Each sandwich cost $6.25

Step-by-step explanation:

Subtract the price of magazine then divide the remaining amount with 2 since the price of sandwiches same

(20 - 7.5) ÷ 2 = 6.25

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

what is the original number? you forgot to add it.