Brantley and shawna walk to grandma's house at a rate of 4 mi/hr. they ride their bicycles back at 8mi/hr over the same route that they walked. it takes 1 hr longer to walk than to ride. how long did it take them to walk to grandma's?

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.