Lesson: Challenging Problem Solving - 25t05

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.

Now use the productivity rate of two machines to determine how long it will take them to complete of the job together. Enter your response into the box below and then click Continue.

Two machines can complete of the job in minutes.

Two machines can complete of the job in 30 minutes. They must still complete another of the job in order to finish , or , of the job. They must double the amount of time, so they need to work 30 + 30 = 60 minutes to complete of the job. Back Next

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