Doug can deliver his papers in 45 minutes. If Meg helps, they can finish in 20 minutes. How long would it take Meg working alone?

Question

I need an answer ASAP!

Answer 1

How much gets done per minute?

 

1/45 + 1/m = 1/20

 

Once we find and apply the common denominator (180m), we only deal with the numerators.

 

4m + 180 = 9m

5m = 180

m = 36 minutes