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help with light

1.  when light falls on a surface which irregular compared to its wavelength   a.  the reflection is diffuse b.  glare is produced c.  the wavelength is refracted d...

What is the speed?

The speed of a stream is 5 mph. If a boat travels 46 miles downstream in the same time that it takes to travel 23 miles upstream, what is the speed of the boat in still water?


From a point on a river, two boats are driven in opposite directions, one at 9 miles per hour and the other at 8 miles per hour. In how many hours will they be 68 miles apart?

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