One hot air balloon is 10 meters above the ground and is rising at a rate of 20 meters per minute. A second balloon is 100 meters above the ground and is descending at a rate of 15 meters per minute. In how many minutes will the two balloons be at the same height?

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.