A person passed 1/3 of the road at a speed of 15 km / h, and the rest at a speed of 5 km / h
| January 29, 2021 | education
A person passed 1/3 of the road at a speed of 15 km / h, and the rest at a speed of 5 km / h, it is necessary to find V av?
To find the value of the average speed of the specified person, we apply the formula: Vav = S / (t1 + t2) = S / (S / 3Vd1 + 2S / 3Vd2) = 1 / (1 / 3Vd1 + 2 / 3Vd2).
Values of variables: Vd1 – speed on 1/3 of the road (Vd1 = 15 km / h); Vd2 – speed on the rest of the road (Vd2 = 5 km / h).
Calculation: Vav = 1 / (1 / (3 * 15) + 2 / (3 * 5)) = 6.43 km / h.
Answer: The average speed of this person was 6.43 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.
