A river flows at 2.8 kilometer per hour and Anita takes 8 hours to row 20 kilometer up the river and back.The relation between her speed in rowing as a function of time.
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Answer:
nightowl
A river flows at 2.8 km/h and Anita takes 8h to row 20 km up the river and back. How fast was she rowing?
Assuming 20 km is the total distance up the river and back.
Let r = row speed in still water
t = time it takes to row up river
upstream :
10= ( r - 2.8) * t
downstream:
10= ( r + 2.8) (8-t)
http:///1lEbLLD
r = 1/20 (25+sqrt(3761)) ~~ 4.32 km/hr
Report · 23/11/2015
Step-by-step explanation:
done brainlest plss
Let r = row speed in still water
t = time it takes to row up river
upstream :
10= ( r - 2.8) * t
downstream:
10= ( r + 2.8) (8-t) r = 1/20 (25+sqrt(3761)) ~~ 4.32 km/hr
Let r = row speed in still water
t = time it takes to row up river
upstream :
10= ( r - 2.8) * t
downstream:
10= ( r + 2.8) (8-t) r = 1/20 (25+sqrt(3761)) ~~ 4.32 km/hr