The motor boat moves along the river against the current. The boat’s own speed is 4 m / s, the water speed is 1.5 m / s.
| November 30, 2020 | education
The motor boat moves along the river against the current. The boat’s own speed is 4 m / s, the water speed is 1.5 m / s. How long does it take for the boat to cover the distance of 9 km?
Since the boat is moving against the current, its speed relative to the ground will be equal to 2.5m s. The time taken to overcome 9 km is 9000 / 2.5 = 3600 s = 1 hour.
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