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emmainna [20.7K]
3 years ago
13

A river has a steady speed of 0.480 m/s. a student swims upstream a distance of 1.00 km and swims back to the starting point. (a

) if the student can swim at a speed of 1.40 m/s in still water, how long does the trip take?
Physics
1 answer:
gregori [183]3 years ago
4 0

Steady speed of river = 0.480 m/s

Swimming speed of student in still water = 1.40 m/s  

When the student is swimming upstream the  velocity he is going up = 1.40-0.48= 0.92 m/s

When the student is swimming downstream the  velocity he is going down = 1.40+0.48= 1.88 m/s

Time taken to travel upstream = \frac{1000}{0.92} =1087 seconds = 18.12 minutes

Time taken to travel downstream = \frac{1000}{1.88} =592 seconds = 8.87 minutes

Total time taken = 18.12+8.87 = 26.99 minutes

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