SOLUTION: You can wash a car in 25 minutes, your brotheew can wash a car in 15 minutes. How long does it take you both to wash a car? I tried to add the minutes together and divide by 2. I a

Question 348008: You can wash a car in 25 minutes, your brotheew can wash a car in 15 minutes. How long does it take you both to wash a car? I tried to add the minutes together and divide by 2. I also tried taking the number in between 15 and 25.
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
each sibling washes a FRACTION of the car based on their individual time
___ the fractions sum to one (the WHOLE car)

where x is the time together ___ (x / 25) + (x / 15) = 1
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