Question 231084
the clarke family went sailing on a lake. 
their boat averaged 6 kilometers per hour.
: 
the rourke family took their outboard runabout for a trip on the lake for the same amount of time. 
their boat averaged 14 kilometers per hour.
:
 the rourke family traveled 20 kilometers farther than the clark family.
 how many hours did each family spend on their boat trip?
:
Let t = amt of time both spent on the lake
:
C's dist = 6t
R's dist = 14t
:
R's dist = C's dist + 20 km 
14t = 6t + 20
14t - 6t = 20
8t = 20
t = {{{20/8}}}
t = 2.5 hrs 
;
:
Check solution on a calc, find the dist of each
14*2.5 = 35 km
6 *2.5 = 15 km
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differ = 20 km