# An octopus swims 7 km at a speed of 3 km/hr. How long does it take in hours and minutes?

Im having trouble with this question, can someone give me a thorough explanation please.

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• In two hours he swims 6 km and it takes 1/3 of an hour to swim the last 1 km.

So, 2 and 1/3 hours

Alternative method:

You know that speed = distance/time so rearranging that time taken = distance/speed = 7/3.

But perhaps when you got that far, the answer in the form 7/3 looked unfamiliar.

7/3 is 2 and 1/3 hours which is 2 hours and 20 minutes,

(because 1/3 of 60 minutes is 20 minutes).

You should have been able to do this on your own. Since you were having trouble, that should tell you that you need to try to improve your understanding of the lessons before you get seriously behind the others in your class. Speak up and ask for explanations if ever a subject seems confusing.

• Time = Distance / speed

=7/3 hrs =2 hrs. 20 minutes

• 2 1/3 hours or 2 hours and 20 minutes.

• If you are familiar with the relationship Distance = Rate times Time, you

will recognize that here Distance is [7km], Rate is speed =[3km/hr] & Time

is [hr]. So D = RT and T = D/R = {7km}/[3km/hr] = (7/3)[hr] = (2 1/3)[hr] =

2hr, 20 min. End of story.

• 7 km × (1 hour)/(3 km) = 7/3 hours = 2⅓ hours

⅓ hour × (60 min)/hour = 20 min

2⅓ hours = 2 hours and 20 minutes

• speed = distance / time <<< solve for time

time = distance / speed

time = 7 / 3 = 2 and 1/3

so 1/3 of an hour = (1/3) X 60 = 20 min.

answer ... 2 hours and 20 min.

• t = 7 / 3 h

t = (7/3) x 60 min

t = 140 min = 2 h 20 min