A pedestrian walked for 4 hours, of which 1 hour at a speed of 8 km / h and three hours at a speed of 9 km / h
| September 11, 2021 | education
A pedestrian walked for 4 hours, of which 1 hour at a speed of 8 km / h and three hours at a speed of 9 km / h, determine the average speed of a pedestrian?
Initial data: t (total travel time of the pedestrian) = 4 hours; the first section of the route (t1 = 1h; V1 = 8 km / h); the second section of the route (t2 = 3 h; V2 = 9 km / h).
The average speed of a pedestrian is determined by the formula: Vav. = S / t = (S1 + S2) / t = (V1 * t + V2 * t2) / t.
Calculation: Vav. = (8 * 1 + 9 * 3) / 4 = 35/4 = 8.75 km / h.
Answer: The average speed of a pedestrian is 8.75 km / h.
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