Answer:
look at picture.
Step-by-step explanation:
every angle in a triangle equals 180° and every straight line equals 180°. So you just take the angles given in each triangle and subtract from 180° to get the total of the 3rd angle.
10 seconds
using the formula we can see that since 30 seconds have passed we divide this by 3 to get 10.
Therefore the answer is 10 seconds
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