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.
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)
12/(x-2) + 12/(x+2) = 2.5
hint: multiply both sides by (x+2)(x-2), simplify and you have your quadratic