There are 630 dishes that need to be rinsed. Scott can in 105 himself. It will take his friend Joe 70 minutes to rinse these dishes. rinse them minutes by How long will it take them if they rinse these 630 dishes together?
Scott can do 630 dishes in 105 minutes. Therefore he would wash
Joe can do 630 dishes in 70 minutes. Therefore, he would wash
That means that if they wash the dishes together, every minute would mean that they would be able to wash
Since there are 630 dishes to be washed, they would take together