Adrill can dig through rock at a rate of 2 1/2 inches per hour. how many hours will it take for the drill to reach five feet below the rocky surface, assuming it maintains this rate of digging?

 24 hours

Step-by-step explanation:

Given : A drill can dig through rock at a rate of inches per hour.

i.e. Speed=   inches per hour.

Formula we use here is :

We assume that it maintains this rate of digging.

Since 1 feet = 12 inches

Depth to dig =

The number of hours it will take  for the drill to reach 5 feet below the rocky surface will be

Hence, it will take 24 hours for the drill to reach five feet below the rocky surface.

a

step-by-step explanation:

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