book Maths Puzzle Numerical Ability

PLEASE HELP! One pipe can fill a swimming pool in 5 hours less than another. Together they fill the swimming pool in 5 hours. How long would it take each pipe to fill the tank alone?

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book Other Question
The Tour de France included 20 parts of vaarious lengths for a total of 3453 km. Stage 17 ran from Vrive-la-Gaillarde to Montlucon at a length of 194 km. If at one point the winn cross multiply the proportion
500x=(x-5)(500+5x)

Cross multiply and solve
600(x+20=(600-x)/x

solve 12(9-x)+12(9+x)=3
finally
x^2+24=(x+1)^2-25