Question 1122270
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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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<pre>
              SPEED       TIME    DISTANCE
A to B         r+c         5        70
B to A         r-c         7        70
TOTAL                     12
</pre>


RATE x TIME = DISTANCE
{{{R*T=D}}}

{{{R=D/T}}}


{{{system(r+c=70/5,r-c=10/7)}}}


From that system, this simpler system should be clear:


{{{system(r+c=14,r-c=10)}}}


Question asks for c.



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{{{c=2}}}