Wednesday

April 23, 2014

April 23, 2014

Posted by **mike** on Tuesday, September 25, 2012 at 7:47am.

- algebra -
**Reiny**, Tuesday, September 25, 2012 at 8:25amLet her rate in still water be x km/h

time in still water = 25/x hours

time to go upstream = 12/(x-2)

time to go downstream = 12/(x+2)

12/(x-2) + 12/(x+2) = 25/x

(12x + 24 + 12x - 24)/(x^2 - 4) = 25/x

24x/(x^2 - 4) = 25/x

25x^2 - 100 = 24x^2

x^2 = 100

x = ± √10

rate in still water is 10 km/h

**Related Questions**

Physics - A canoeist is trying to paddle upstream in a river that has a velocity...

RATE, DISTANCE, TIME - TIM PADDLED HIS KAYAK 12 KM UPSTREAM AGAINST A 3 KM/H ...

PhysicsIn what direction relative to north must ca - Two canoeists start ...

Algebra 2 - how would you solve: the current in the river flowed at 3 mph. The ...

algebra - a boat goes 16 Km upstream and 24 Km downstream in 6hrs.it can go 12Km...

algebra - a boat goes 16 Km upstream and 24 Km downstream in 6hrs.it can go 12Km...

physics - What is the radius of the event horizon (or Schwartzchild radius) of ...

Math - Jared can paddle his canoe 1 mile upstream in 1 hour, but it takes only a...

mathematics - a boat travels 12 km upstream and back in 1 hour and 45 min.if the...

Physics - A motorboat travels at a speed of 40 km/h relative to the surface of ...