Crossing Crocodile River

Sam and Sara are on a jungle hike when they come to a fast-fl owing river. They can see several crocodiles swimming in the river. Sam and Sara need to cross the river.

Can you help Sam and Sara get across the river safely?

Design and make a safe and strong bridge that:

• is at least 20 cm long without touching the water
• is at least 10 cm above the water
• supports the weight of at least Sam and Sara

• Is the bridge 20 cm long or even longer?
  Measure with a ruler or with the LEGO^® DUPLO^® box lid, which is 27 cm wide. The longer, the better.

• Is it at least 10 cm above the water?
  Measure it and see.

• Is it safe?
  Take the Sam and Sara models for a walk across the bridge.
  Can Sam and Sara walk on the bridge at any place without falling through holes or gaps?

• How much weight can it carry?
  *Where might the weakest place be? In the middle! Start with Sam in the middle, add Sara.

Still OK? Then keep adding more weight (e.g. bricks) until it breaks! The more weight it can carry, the stronger the bridge.*

Design a boat that can go under your bridge and sail down the river.