It would take Chris 8 hours and Julissa 2 hours?

Question

    Julissa can unload a ship’s cargo twice as fast as Chris. Together, they can unload the cargo in 4 hours. How long would it take each of them working alone to unload the cargo?

Answer 1

 

 

4(1/C + 2/C) = 1

 

(1/C + 2/C) = 1/4

 

3/C = 1/4

 

C/3 = 4

 

C = 12

 

Since Julissa is twice faster than Chris, Julissa can do the job at half of Chris' time (1/2 * 12 = 6 hours)

 

Chris can do it alone in 12 hours

Julissa can do it alone in 6 hours