Answer: D-18 years, Joan-41 years
Step-by-step explanation:
Given
The Sum of Debbie and Joan's age is 59
Take x and y as the age of Debbie and Joan
In 5 years, twice Debbie's age will be equal to Joan's age


Also, 
solving these two equations we get

Answer:
Step-by-step explanation:
What's the question?
5 min =hour 1/12
10 min 1/6
15 min 1/4
10 times 1.0 is 10 itself
Hope this helps!!