Answer:
Step-by-step explanation:
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R=xa+xb, r-xa=xb, b=r-xa/x
Look at deonomators
assuming that the deonomenators are 5x+15y and 2x+6y
find their LCM
factor
5x+15y=5(x+3y)
2x+6y=2(x+3y)
LCM=10(x+3y)=10x+30y
multiply 2/(5x+15y) by 2/2=4/(10x+30y)
multiply 1/(2x+6y) by 5/5=5/(10x+30y)
if we add them
9/(10x+30y)
Answer:
8 days
Step-by-step explanation:
90/3 = 30 mi/day
240/30 = 8 days
