What is the average speed of a car if in the first 3 hours it drove 80 km, and for the next 2 hours

What is the average speed of a car if in the first 3 hours it drove 80 km, and for the next 2 hours it moved at a speed of 50 km / h.

Formula for calculating average vehicle speed:

Vav. = S / t, where S is the entire path covered by the car (S = S1 + S2), t is the total time of movement of the car (t = t1 + t2).

The first 3 hours of the journey:

S1 = 80 km, t1 = 3 h.

Second 2 hours of the journey:

t2 = 2 h, V2 = 50 km / h, whence S2 = V2 * t2.

Vav. = (S1 + S2) / (t1 + t2) = (S1 + V2 * t2) / (t1 + t2).

Let’s do the calculation:

Vav. = (80 + 50 * 3) / (3 + 2) = 230/5 = 46 km / h.

Answer: The average speed of the car along the entire route is 46 km / h.