At noon, a motor ship departed from the pier at a speed of 16 km / h. After 3 hours, another motor ship departed after

| January 3, 2021 | education

At noon, a motor ship departed from the pier at a speed of 16 km / h. After 3 hours, another motor ship departed after him and after 12 hours caught up with the first. At what speed did the second motor ship move?

According to the terms of the problem, the second motor ship departed 3 hours later, after the first motor ship departed from the pier, and the second motor ship caught up with the first in 12 hours. Consequently, the first motor ship moved 12 + 3 = 15 hours until the moment when the second motor ship caught up with it. It is known that the speed of the first motor ship is 16 km / h, therefore, in 15 hours, the first motor ship sailed a distance equal to 15 * 16 = 240 km. The second motor ship sailed the same distance, spending 12 hours on it. Consequently, the speed of the second motor ship was 240/12 = 20 km / h.
Answer: the second motor ship was moving at a speed of 20 km / h.



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