SPRINGFIELD+CHALLENGES

Becoming a Problem-Solving Genius (Zacarro's book): THINK ONE IS THE TITLE OF THIS CHAPTER!

HINT: THINK ONE

It takes 5 workers 12 hours to unload one truck. How long would it take 6 workers to unload the truck?
 * Level 1-1: **

Level 1-2: ==After an explosion of an oxygen tank, three astronauts were forced to move into the lunar lander that was attached to their spacecraft. If the lunar lander had just enough oxygen to last 2 people for 6 days, is there enough oxgen for 3 astronauts if their journey back to earth will take 4 days? Why or why not?==

When Mike uses a riding mower, it takes him 3 hours to mow his lawn. When he uses a push mower, it takes him 6 hours to mow the lawn. (His sister also can mow the lawn with the push mower in 6 hours.) Mike wanted to get the lawn mowed as quickly as possible, so he paid his sister $10 to mow with the push mower while he used the riding mower. How long will it take Mike and his sister to mow the lawn if they work together?
 * Level 2-1: **

If one extra person decided to go on the trip, how long will the food last?
It takes a crew of 4 painters 12 hours to paint one house. If they wanted to paint the house in 8 hours, how many additional painters must they have?
 * Level 3-1: **

Level 3-2: Hose A can fill a pool in 4 hours. Hose B can fill the pool in 2 hours. If both hoses are turned on at the same time, how long will it take to fill the pool?

When the drain is closed, a swimming pool can be filled in 4 hours. When the drain is opened, it takes 5 hours to empty the pool. The pool is being filled, but the drain is accidentally left open. How long until the pool is completely filled?
 * Einstein Level-1: **

Einstein level-2 It takes 3 city snowplows 14 hours to clear 500 miles of road. If the city wants the 500 miles of road to be cleared in 6 hours, how many additional snowplows must they buy?