The correct expression to calculate Albert Walsh's unit rate in miles per hour is:
d) 405 / (5/12)
This expression represents dividing the distance by the time to find the rate.
Albert Walsh 405 of a mile in 5/12 of an hour which expression can be used to calculate his unit rate in miles per hour 8405 - 5/12b 5/12 - 4/5c 5/12 4/5 d 405 5/12
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