How long did a pedestrian travel if he walked 10 km at a speed of 5 km / h and 12 km at a speed of 6 km / h?

Task data: S1 (first leg of the route) = 10 km; V1 (pedestrian speed on the first leg of the path) = 5 km / h; S2 (second leg) = 12 km; V2 (pedestrian speed on the second leg) = 6 km / h.

The duration of a pedestrian’s movement is determined by the formula: t = t1 + t2 = S1 / V1 + S2 / V2.

Let’s make a calculation: t = 10/5 + 12/6 = 4 hours.

Answer: The pedestrian was on the way for 4 hours.

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