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This problem trains for: SAT-I, AMC-8, GMAT.

Two rug weavers share the work on a rug. The more experienced one works for 6 hours in the morning at a speed of 320 knots per hour. The less experienced one works for 4 hours in the afternoon at a speed of 280 knots per hour. What is the average hourly speed of the two weavers?

It is very important to note that the average speed is not the average of the speeds.

The average speed is the total job divided by the total time.

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The average hourly speed is 304 knots per hour.