Question 782024
Domenica and Javier start from the same location at the same time..

Javier rate = x mph
domenica rate = (x+4) mph

They are moving away from each other. effective rate = x+(x+4)=> 2x+4 mph

d=140 miles

t= 4

d=rt

140=(2x+4)*4

140=8x+16

140-16=8x

124=8x

/8
124/8=x

15.5 

Javier rate = 15.5 mph

Domenica rate = 15.5+4 = 19.5 mph