Question 951429
VARIABLES ASSIGNMENTS
r, outbound rate
R, return rate
t, time spent for "going" outbound
k, how many fewer minutes for return trip than outbound
d, one-way trip distance


QUESTION:  Find total travel time.


____________________rate____________time___________distance
GOING_______________r________________t______________d
RETRNG______________R_______________t-k/60__________d


KNOWN VALUES
r=30
R=40
k=16



UNKNOWN VALUES
t, d.



SOLVE


{{{system(rt=d,R(t-k/60)=d)}}}

{{{rt=R(t-k/60)}}}
{{{rt=Rt-kR/60}}}
{{{rt-Rt=-kR/60}}}
{{{Rt-rt=kR/60}}}
{{{t(R-r)=kR/60}}}
{{{highlight(t=kR/(60(R-r)))}}}, being reminded that k needs to be a quantity in MINUTES.  t will be in hours.


Evaluate {{{t}}}, and then find {{{highlight_green(t+(t-k/60))}}}.