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Answer:
 (1/120 mile/min)(60 min/h)(3 h)
 1.5 mile
 the increase in depth after 3 hours
Step-by-step explanation:
The rate is given in terms of miles per minute. To find the elevation after 3 hours, we need a conversion from minutes to hours. One possible product is ...
 (1/120 mile/min)(60 min/h)(3 h)
The value of this product is ...
 (1·60·3)/(120·1·1) mile = 1.5 mile
The value represents the increase in depth after 3 hours.
