book Maths Puzzle Numerical Ability

Ok i have this math problem but i dont understand how to find the answer the problem is: 11(4-6y)+5(13y+1)=9

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(5-y)+(6-y)-(5-y)=0 what does y equal??? Ruth bicycles 5km/h slower than bill. In the time that it takes Ruth to bicycle 42km, bill can bicycle 57km. How fast does each bicyclist travel?