Question 1006262
For the return trip:
{{{ d = r*t }}}
{{{ d = 36*.9 }}}
{{{ d= 32.4 }}} km
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Going to the cabin:
{{{ d = r*t }}}
{{{ 32.4 = 40.5*t }}}
{{{ t = .8 }}} hrs
The trip to the cabin took .8 hrs