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Julie drives 100 mi to grandmother's house. On the way, Julie drives half the distance at 40 mph and half the distance at 60 mph. On her return trip, she drives half the time at 40 mph and half the time at 60 mph.
(A) How long does it take Julie to complete the trip to grandmother's house?
(B) How long does the return trip take?
A tourist takes a picture of a mountain 14 km away using a camera that has a lens with a focal length of 50 mm, What is the ratio of the height of the mountain's image on the camera's image
A diffraction grating has 3283 lines/cm. Light that contains all wavelengths between 480 and 659 nm shines on the grating
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