SOLUTION: Sally travels all the way from her house to the library. The library is 3 km from her house and it takes half an hour to arrive there. Sally first walks 5 km/h, and then runs 10 km
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Question 386978: Sally travels all the way from her house to the library. The library is 3 km from her house and it takes half an hour to arrive there. Sally first walks 5 km/h, and then runs 10 km/h later. How long did Sally walk before she ran? Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! Sally travels all the way from her house to the library. The library is 3 km from her house and it takes half an hour to arrive there. Sally first walks 5 km/h, and then runs 10 km/h later. How long did Sally walk before she ran?
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let her walk x km
she will run 3-x km
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t=d/r
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time walk +time run = total time
x/5 + (3-x)/10 = 1/2
LCD =10
(2x+(3-x))/10=1/2
(2x+3-x)/10=1/2
(x+3)/10=1/2
cross multiply
2(x+3)=10
2x+6 = 10
-6 -6
2x=4
/2
x=2 the km she walked
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m.ananth@hotmail.ca
