Question

Joe and Kim washed 27 cars in 6 hours. The next day, they had more help and washed twice as many cars in the same amount of time. What was their average car-washing rate on the second day?
A. 4.5 cars per hour
B. 5 cars per hour
C. 6.2 cars per hour
D. 9 cars per hour

Answer 1

The correct answer is 9 cars per hour on the second day. How I found my answer...
27x2=54
54 is the total amount of cars done on the second day. To find the amount per hour just divide by 6
54/6=9
Hope that Helps!