# GMAT Question of the Day – DS Rate/Work

Three machines J, K, and L working simultaneously but independently at their respective rates can complete a certain task in 32 hours. What proportion of the completed task did machine K complete?

(1) Machines J and K working simultaneously but independently at their respective rates can complete the task in 48 hours.

(2) Machine J can complete the task in half the time that Machine L can complete the task.

[spoiler]**C.**[/spoiler]

Here are another bunch of cooperative work and rate questions to practice on:

Cooperative Rate Question from the GMAT Official Guide. This one is problem solving so a little different but still coop rate. It’s a good one for practicing picking numbers.

These are all cooperative rate questions from GMAT Question of the Day:

For more distance, work, and rate examples you can also check out our GMAT Question of the Day page