Thursday

January 29, 2015

January 29, 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

**Answer this Question**

**Related Questions**

math - A boat traveled 210 miles downstream and back. The trip downstream took ...

MATH - 1. A boat traveled 210 miles downstream and back. The trip downstream ...

Algebra - What system of equations do I use to solve the following question? A ...

Math - A boat travels 12 miles up a river, then returns to where it started. The...

algebra - HOW DO SOLVE A BOAT TRAVELED 336 MILES DOWNSTREAM AND BACK. THE TRIP ...

math - A boat traveling downstream a distance of 39 miles then came right back....

UPSTREAM - THIS EXURSION WITH A BOAT TRAVEL 35KM UPSTREAM AND THEN BACK AGAIN IN...

math - it took 3 hours for patrol boat to travel 48km upstream and 2 hours to ...

Algebra - 5.) A boat makes a trip downstream in 5 hours. The return trip against...

Algebra 2 - 5.) A boat makes a trip downstream in 5 hours. The return trip ...