INTERNET PUMP ADVENTURE

Kendall put the plug back in the pipe at the bottom of the cistern as the other two raced downstairs. The tub was filled with water (15 inches high without the backpacks!) and the backpacks were all wet. Fortunately, not much time had gone by, and the water hadn't had a chance to seep into the packs. They put them on the stairs to dry. Matt saw a note on the back side of the washtub. When opened, it read: (click on the note to read it)

After thinking it through, Matt, Kendall, and Chelsea did calculate correct amount of time. Can you figure it out? You can either try it for yourself using the information in the text and on the blueprint, or you can follow along with Kendall, Chelsea, and Matt on the worksheet on the next page. Here are three possible answers; only one is correct:

2.72 sec 10.9 sec 21.8 sec

If you did well on this problem, how about trying the bonus question?