Question 983799
w, speed of wind
r, craft speed without any wind
u, distance traveled against the wind (u for UPWIND)
v, distance traveled with the wind
t, time of travel being same for both u and v
UNKNOWN VARIABLES are t and w.


Basic uniform rate rule for travel is RT=D to relate speed, time, and distance


<pre>
                 speed          time          distance
WITHWIND         r+w             t             v
AGAINSTWND       r-w             t             u
</pre>


System of Equations Using the described and tabulated data:
{{{highlight_green(system((r+w)t=v,(r-w)t=u))}}}


Solve the system as a formula for w in all known or given variables only.


Evaluate w using the given values.
{{{system(r=255,u=210,v=300)}}}