Lucy and Emily are racing with each other and Lucy is 90 meters in front of Emily. The distance (in meters) that Lucy
runs, for every second t, can be given by A(t)=2t and the
distance (in meters) that Emily runs, for every second t can be
given by B(t)= 5t. How many seconds will it take for Emily to
catch up with Lucy? Give your answer to the nearest whole
number.