SOLUTION: jammuna rode a boat a to b and back to a in a totl time of 12 hrs out of which she rode for 5 hrs in the direction of the flow of the stream the distance between a and b is 70 km f

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Question 1122270: jammuna rode a boat a to b and back to a in a totl time of 12 hrs out of which she rode for 5 hrs in the direction of the flow of the stream the distance between a and b is 70 km find the speed of the stream
Answer by josgarithmetic(39615) About Me  (Show Source):
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jammuna rode a boat a to b and back to a in a totl time of 12 hrs out of which she rode for 5 hrs in the direction of the flow of the stream the distance between a and b is 70 km find the speed of the stream
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This is a better problem description:
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Jammuna rode a boat from A to B and back in total time of 12 hours. Five hours were ridden in the stream's direction, and the A to B distance was 70 kilometers. Find the speed of the stream.
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              SPEED       TIME    DISTANCE
A to B         r+c         5        70
B to A         r-c         7        70
TOTAL                     12


RATE x TIME = DISTANCE
R%2AT=D
R=D%2FT

system%28r%2Bc=70%2F5%2Cr-c=10%2F7%29

From that system, this simpler system should be clear:

system%28r%2Bc=14%2Cr-c=10%29

Question asks for c.


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c=2