SOLUTION: Candy can boat around the shore of Lake Sawyer in 3 hours and 15 minutes. If she decreases her average speed by 0.5 km/hr then her time increases by 15 minutes. How many kilometers
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Question 902075: Candy can boat around the shore of Lake Sawyer in 3 hours and 15 minutes. If she decreases her average speed by 0.5 km/hr then her time increases by 15 minutes. How many kilometers long is the shore of the lake?
You can put this solution on YOUR website! Candy can boat around the shore of Lake Sawyer in 3 hours and 15 minutes. If she decreases her average speed by 0.5 km/hr then her time increases by 15 minutes. How many kilometers long is the shore of the lake?
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let x=distance around the lake shore
let s=initial speed of boat
(s-.5)=reduced speed of boat
distance/speed=travel time
..
x/s=3.25 hrs
x/(s-.5)=3.25+.25=3.5
..
x=3.25s
x=3.5(s-.5)=3.5s-1.75
3.25s=3.5s-1.75
.25s=1.75
s=7
x=3.25s=22.75
How many kilometers long is the shore of the lake? 22.75 km
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