A Boat Moves Through the Water in a River at a Speed

question 38

Multiple Choice

A boat moves through the water in a river at a speed of 8 m/s relative to the water.The boat makes a trip downstream and then makes a return trip upstream to the original starting place.Which trip takes longer?

• A)the downstream trip
• B)the upstream trip
• C)Both trips take the same amount of time.
• D)The answer cannot be figured without knowing the speed of the river flow.

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Definitions:

Brain Imaging Techniques

Methods used in neuroscience and psychology to visualize the structure or function of the brain, including MRI, CT scans, and PET scans.

Epidemiology

The study of the incidence and prevalence of disorders in a population.

Incidence

The occurrence, rate, or frequency of a disease, crime, or something else undesirable.

Prevalence

The proportion of a particular population found to be affected by a medical condition at a specific time.