Homework Help: math

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

a patrol boat took 2.5 hours for a round trip 12km upriver and 12km back. the speed of the current was 2 km/h. what was the speed of the boat in still water?

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 12:31am
speed 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
math - Anonymous, Tuesday, January 22, 2013 at 12:17pm
G

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