Answer:
When there is wind it takes longer
Explanation:
With no wind, the round trip time is

When we have a constant wind speed w

comparing the reciprocal times;

This means that t1 is smaller than t2, ergo, it takes longer with wind
Answer:
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Explanation:
The focal point of a concave mirror is halfway along the radius, therefore the radius would be 2•16= 32 cm