Arithmetic question with distance speed and time

Question

If I have a time of departure with is 10:35 and I have an arrival time of 12:55 and the distance 36km how do I calculate average speed? I get the formula of distance speed and time but it says the answer is 15 3/7 km/hr and I’m really confused on how it is.

Avg speed = total distance / total time. Have you computed these? — Ben W, Jan 07 '19 at 17:08
What is the elapsed time in hours from $10$:$35$ to $12$:$55$? — KM101, Jan 07 '19 at 17:09
Tried finding the differences of the times which got me 02:20 and I had to covert it to 2 1/3 hours and then I know I have to divide 36 by something but that’s as far as I got really — baek won, Jan 07 '19 at 17:10
$2 \frac{1}{3} = \frac{7}{3}$ and $\frac{36}{\frac{7}{3}} = \frac{36\cdot 3}{7} = \frac{108}{7} = 15\frac{3}{7}$. — KM101, Jan 07 '19 at 17:13
I need a solution to this answer that is what I don’t get. I get so far and then I miss a step which doesn’t get me the answer which is 15 3/7 — baek won, Jan 07 '19 at 17:14
Wait how do you get 7/3 sorry if I’m asking stupid questions — baek won, Jan 07 '19 at 17:15
You can rewrite is as an improper fraction. $2$ is the same as $\frac{6}{3}$ so $2\frac{1}{3}$ is the same as $\frac{6+1}{3} = \frac{7}{3}$. — KM101, Jan 07 '19 at 17:15
Okay I got thank you so much guys you’re all life savers!! — baek won, Jan 07 '19 at 17:17
What if it doesn’t say the distance travelled or average speed and it’s just the time of departure= 12:15 and time of arrival=14:45 how do you calculate distance travelled? — baek won, Jan 07 '19 at 17:38

score 0 · Answer 1 · answered Jan 07 '19 at 17:13

0

Once you calculated 2 1/3 hours, you can figure out what to do next with units. The answer is speed, which has units (distance)/(time). So you divide the distance (36 km) by the time (2 1/3 hours) to get 15 3/7 km/hr.

answered Jan 07 '19 at 17:13

Calvin Godfrey

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Arithmetic question with distance speed and time

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