Abby's Abby remembers that her mother's birthday is after 13 but before the 19th of July her sister Sarah remembers that her mother is what day is before the 21st and after the 17th of July on which date of July is their mother's birthday

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

answer: 2 and 1

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