A scientist is performing an experiment on an up-the-floor escalator in a mall. The scientist ran up the escalator and took 50 steps to reach the upper boom. Then, he ran back down the same escalator and took 125 steps to reach back the lower boom. The pace of the scientist going down is five times faster going up. How many steps are visible on the escalator if it is shutdown? The problem is good for 15 minutes....or more! Haha! I'll post the solution and answer on Monday :) Happy solving!