Time (t) – 1.8 h,
Distance (S) – 27.18 km.
Current speed (Vt) – 6.3 km, h.
Find: boat speed (Vк).
It is known that the boat, moving along the river, covered 27.18 kilometers in 1.8 hours. Let’s calculate the speed of the boat along the river (Vkt) by the formula:
S = V * t,
V = S: t.
Vct = 27.18: 1.8 = 15.1 (km / h).
Knowing the speed of the boat downstream and the speed of the river flow, we find the speed of the boat:
Vk = Vkt – Vt = 15.1 – 6.3 = 8.8 (km / h).
Answer: the boat’s own speed is 8.8 km / h.
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