Scaling the Secret Tower
Your friend Korlax has been captured by a rogue band of Keepelsnaps (bad guys). You followed their trail and by early afternoon you tracked them to their secret tower hideout.
All you need to do now is scale the tower and rescue Korlax. You just have to figure out how.
You check your bag and rejoice that you remembered to pack your tape measure, grappling hook and rope!
But there's a problem. You only have 50 meters of rope, and the tower looks pretty tall!
If you don't have enough rope you can't climb the tower, and Korlax will be doomed to spend the day listening to KeepleJazz (a type of music only a band of rogue Keepelsnaps could enjoy).
You're tempted to just try it, but the risk of a failed attempt alerting the guards is too high. You have to be sure it will work.
As you think it over, the shadows grow longer. Then a thought pops into your head: "The shadows! I can use the shadows!"
You are 2 meters tall. Your shadow is 3 meters long.
All that's left is to measure the tower's shadow. It comes out to 60 meters, and your tape measure is thankfully longer than your rope.
Given these measurements, how can you tell if you have enough rope to scale the tower?
You can solve this problem with the instruments provided. Pick the ones that help.
You won't need all of them. Choosing the right instruments is part of the challenge.