Question

It takes Bobby 12 hours longer to build a robot than it takes Alex. Together, they can build the Robot in 8 hours. How long does it take Bobby to build the robot by himself?

Answer 1

24 hours

Explanation:

The computation of the number of hours taken by Bobby to build the robot by himself is shown below:

Given that

Bobby could take 12 hours

Together they could build in 8 hours

So based on the above information

the number of hours taken by Bobby to build the robot by himself is

Let us assume the above line be x

So,

`(1)/(8)-(1)/(12) = (1)/(x) \\\\(6 - 4)/(48) = (1)/(x) \\\\(2)/(48) = (1)/(x) \\\\x = (48)/(2)`

x = 24 hours