Problema Solution
Bob can type 2 letters in 4 hours while Bill can do it in 6 hours. How many hours would it take them to type six letters together?
Answer provided by our tutors
Bob's rate is: 2/4 = 1/2 letter per hour
Bill's rate is: 2/6 = 1/3 letter per hour
Let 'x' represent the hours they need to type 6 letters alone.
The together rate is: 6/x letters per hour
Now we can write:
1/2 + 1/3 = 6/x
........
click here to see the equation solved for x
........
x = 7.2 hr
x = 7 hr 0.2*60 min
x = 7 hr 12 min
Bob and Bill can type 6 letters in 7 hours and 12 minutes.