anonymous
  • anonymous
Abdul, while driving to school, computes the average speed for his trip to be 20 km/hr. On his return trip along the same route, there is less traffic and the average speed is 40km/hr. What is the average sped for Abdul's trip?
Physics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
You need to find the total distance and the total time. The total distance is two times the distance to school, 2d.\[s=d/t=>t=d/s\]Where s is speed, d is distance and t is time. So the time taken to get to school is:\[d/s _{1}\]and the time taken to get back is:\[d/s _{2}\]so the total time is:\[d/s _{1}{+}d/s _{2}=d(1/s _{1}+1/s _{2})\]So, as speed = distance/time, divide the total distance by the total time:\[2d/d(1/s _{1}+1/s _{2})=2/(1/s _{1}+1/s _{2})=2/(1/20+1/40)=80/3\approx26.7km/hr\]
anonymous
  • anonymous
@bendt.......I didn't understand the last part of the solution 2(1/20+1/40)=80/3=26.7 how? cn u plz explain
anonymous
  • anonymous
Do you mean you don't understand why\[2/(1/20+1/40)=80/3\]or you don't understand how I got that expression?

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
why? 2(1/20+1/40)=80/3
anonymous
  • anonymous
\[2(1/20+1/40)=2(2/40+1/40)=2/(3/40)=80/3\]

Looking for something else?

Not the answer you are looking for? Search for more explanations.