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Question:

It took Khalid 90 minutes to complete 40 tasks. what is the equivalent rate?

A 10 tasks in 22.5 minutes
Explaination

Ninety minutes to complete 40 tasks is an average rate of 2.25 minutes per task (90 minutes ÷ 40 tasks). Multiplying this rate by 10 gives the average number of tasks Khalid completed every 10 minutes (2.25 × 10 = 22.5).