Science

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The 2m pole having a 3m shadow reveals the red having a 6m shadow will have 4m in height 

Since the pole to the wall in the back is mapped 1:1 from the light source the 4m shadow on the wall should reflect the remaining height 

So 4+4 equals 8

I think!
Can you please share your solution?

Working for the day 🗓️ when we can travel the world & everyone accepts native, non-custodial held crypto

Hmm, the correct answer might be 8 meters. if you imagine the 4m shadow as the 2 green blocks, you'll get a shadow of 6 meters. adding this imaginary shadow to the original horizontal shadow of 6m , you'll get a total shadow length of 12m for the red block 

1) 2/3 = x/12
2) 24/3 = x
3) 8 = x = red bar

Not 100% confident, but ⤵️

1) 2/3 = x/(6+4) 
2) 20/3 = x
3) 6.66 = x = red bar

the red bar's shadow casted on the wall is the same length as if there was no wall since it goes up in a 90 degree angle. therefore the total shadow length of the red bar is 10m.