Question 972371
RT=D and a right triangle.


t, time in hours.


{{{(300t)^2+(200t)^2=500^2}}}


{{{9t^2+4t^2=25}}}


{{{13t^2=25}}}
{{{t=sqrt(25/13)}}}


{{{t=5/sqrt(13)}}}

{{{t=5sqrt(13)/13}}}
t=1.387 hours or 1 hour 23 minutes 13 seconds.