# The car moved from point A to point B at a speed of 40 km / h, and moved back 30 km / h.

December 29, 2020 | education

| **The car moved from point A to point B at a speed of 40 km / h, and moved back 30 km / h. Determine the average speed for the flight.**

Let’s designate the distance AB as S, then the full path (there and back) is equal to 2S.

Average speed is equal to the ratio of the entire path to the entire time.

Let’s find the time at each site (at the site there, and at the site back):

t1 = S / 40

t2 = S / 30

Total time T = S / 40 + S / 30 = 7S / 120

Find the average speed:

Vav = 2S / (7S / 120) = 2S * 120 / 7S = 240/7 = 31.4 km / h

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.