The own speed of the ship is 20.5 km / h, the speed of the river is 1.4 km / h. First, the ship sailed for 0.6 hours on the lake

| January 3, 2021 | education

The own speed of the ship is 20.5 km / h, the speed of the river is 1.4 km / h. First, the ship sailed for 0.6 hours on the lake, and then for 2.5 hours along the river against the current. What way did the ship go during all this time?

1. Let’s determine how many kilometers the motor ship sailed on the lake in 0.6 hours, if its speed is 20.5 kilometers per hour:
20.5 * 0.6 = 12.3 (km).
2. Let’s find the speed of the motor ship against the river flow, if its speed is 20.5 kilometers per hour, and the speed of the current is 1.4 kilometers per hour:
20.5 – 1.4 = 19.1 (km / h).
3. Find out how many kilometers the ship sailed in 2.5 hours against the river flow:
2.5 * 19.1 = 47.75 (km).
4. Let’s determine how many kilometers the ship sailed:
12.3 + 47.75 = 60.05 (km).
Answer: the ship sailed 60.05 kilometers.



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