Plz help me understand this. I need to know how to do it.

It took Khalid 90 minutes to complete 40 tasks. Which answer choice is an equivalent rate?

A). 10 task in 0.9 minutes

B). 10 task in 2.25 minutes

C). 10 task in 9 minutes

D). 10 task in 22.5 minutes

HELP!!! PLZ!!!

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