Question 486782
E does 1/5 job per hour, L does 1/3 per H.
E does .5 * 1/5 job alone = 0.1 job.
Together they do 1/5 + 1/3 per hour, total (3+5)/15 job/H
Let as usual answer = x = hours to finsh.
8 x / 15 = 1-0.1
x = 0.9 * 15 / 8
x = 1.6875 hours.