Question

You work at an oil refinery and are in charge of draining a tank until the

are 635 gallons left inside. The tank starts with 859 gallons, and you can
drain it at a rate of 56 gallons per minute. How many minutes do you
need to drain the tank to the right level?
You need
minutes.

Answer 1

You need 4 minutes.

Explanation:

You want to know the number of minutes it takes to drain a tank from 859 gallons to 635 gallons at the rate of 56 gallons per minute.

Time

The time required is found by dividing the quantity by the rate.

The quantity of oil that needs to be drained is the difference between the initial amount and the final amount:

859 gal - 635 gal = 224 gal

Then the time required is ...

(224 gal)/(56 gal/min) = 4 min

You need 4 minutes to drain the tank to the right level.

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