Andrea can clean a house 4 times as fast as denise. when they work together, andrea and denise can clean a large house in 8 hours. how many hours would it take denise to clean the house by herself?

20
15
40
5

Kenzie lives 30 kilometers from her cousin houde she drives 23 kilometers before stopping for gas how many meters does she need to travel

Ineed with number 17 i don’t get it at alll

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.