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March 3, 2015

March 3, 2015

Posted by **lawrence** on Friday, October 15, 2010 at 11:21pm.

ps: i just need to know how to make equations from the question above. it's supposed to create equation, then use the quadratic formula to solve and find the answer.

thank you!

- math -
**Reiny**, Saturday, October 16, 2010 at 12:31amspeed of boat in still water ---- x km/h

speed of current ----- 2 km/h

speed against current = x-2

speed with the current = x+2

time upriver = 12/(x-2)

time downriver = 12/(x+2)

equation:

12/(x-2) + 12/(x+2) = 2.5

hint: multiply both sides by (x+2)(x-2), simplify and you have your quadratic

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