Question

Two typers can type a book together in 4 days. How many days will it take each of them to type the book alone if the first one types twice as fast as the second one?

Answer 1

Therefore, the first finished the book alone for the 6 days.

Therefore, the second finished the book alone, for the 12 days.

Explanation:

We have that is the first one types twice as fast as the second one.

The first =2/3

The second =1/3

For first case we have the following proportion:

2/3 : 4=1 : x

x · 2/3 =4

x=6

Therefore, the first finished the book alone for the 6 days.

For second case we have the following proportion:

1/3 : 4=1 : x

x · 1/3 =4

x=12

Therefore, the second finished the book alone, for the 12 days.