Lesson: Challenging Problem Solving - 25t03

Tough Rate Questions, Continued

If five machines working at the same rate can do of a job in 30 minutes, how many minutes would it take two machines working at the same rate to do of the job?

	45
	60
	75
	80
	100

Use the question stem to determine how much of the job one machine could complete in the same amount of time. Enter your response into the box below and then click Continue.

One machine working at the same rate can complete _____ of the job in 30 minutes.

Now use the question stem to determine how much of the job two machines could complete in the same amount of time. Enter your response into the box below and then click Continue.

Two machines working at the same rate can complete / of the job in 30 minutes.

If one machine can do of the job in 30 minutes, then two machines working simultaneously can do twice this amount, or of the job. But we need to determine how long it takes two machines to complete , or of the job.

 

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