Two boats departed from the pier in opposite directions. After 3 hours the distance between them was 144 km.

univerkov | March 20, 2021 | education

Two boats departed from the pier in opposite directions. After 3 hours the distance between them was 144 km. What is the speed of the first boat if the speed of the second boat is 23 km / h.

Method I:
1) 23 • 3 = 69 (km) – the distance that the second boat sailed;
2) 144 – 69 = 75 (km) – the distance that the first boat sailed;
3) 75: 3 = 25 (km / h) – speed of the first boat;
II method:
1) 144: 3 = 48 (km / h) – the total speed of both boats;
2) 48 – 23 = 25 (km / h) – speed of the first boat.
Answer: the speed of the first boat is 25 km / h.

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