Henry asked in Science & MathematicsMathematics · 5 years ago

# 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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• Ian H
Lv 7
5 years ago

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.

• Raj K
Lv 7
5 years ago

Time = Distance / speed

=7/3 hrs =2 hrs. 20 minutes

• 5 years ago

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

• Philip
Lv 6
5 years ago

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.

Lv 7
5 years ago

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

• ?
Lv 7
5 years ago

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.

• Como
Lv 7
5 years ago

t = 7 / 3 h

t = (7/3) x 60 min

t = 140 min = 2 h 20 min

• Rachel
Lv 4
5 years ago

2h20m