<PRE><B>Question 40002</B>
A boat can travel from its dock to a town down river with a 7 mile per hour current in 10 hours. The return trip against the same current takes 15 hours. What is the speed of the boat still in the water?
____ miles per hour


Down River Data:
Distance = ?; Time=10 hrs.; Rate= boat speed + 7
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Up River Data:
Distance = ?; Time=15 hrs; Rate = boat speed - 7
EQUATION:
 distance down = distance up
and distance = rate(time)
 10(boat speed +7) = 15(boat speed -7)
 10boat +70 = 15boat-105
        5boat=175
         boat=35 mph
Cheers,
Stan H.</PRE>