Question

Катер в первый час плыл о скоростью 18км/ч.Во второй час уменьшил скрость на 15%,а в третий час последнюю скорость увеличил на 20%.Какова скорость катера в третий час?

Answer 1

 2ой час   15.3 км/ч
3йй час 18.36км/ч

Answer 2

1) 18 *15 : 100 = 2,7 км/год
2) 18 - 2,7 = 15,3 км/год. плив другу годину з такою швидкістю
3) 15,3 * 20 : 100 = 3,06 км/год
4) 15,3 + 3,06 = 18, 36 км/год швидкість протягом третьої години
  

Answer 3

Calculation of the Boat's Speed in the Third Hour

To calculate the speed of the boat in the third hour, we need to follow the given information step by step.

1. In the first hour, the boat traveled at a speed of 18 km/h.

2. In the second hour, the boat reduced its speed by 15%. To calculate the reduced speed, we multiply the original speed by (1 - 0.15) or 0.85. Therefore, the speed in the second hour is 18 km/h * 0.85 = 15.3 km/h.

3. In the third hour, the boat increased its speed by 20%. To calculate the increased speed, we multiply the reduced speed from the second hour by (1 + 0.20) or 1.20. Therefore, the speed in the third hour is 15.3 km/h * 1.20 = 18.36 km/h.

Therefore, the speed of the boat in the third hour is 18.36 km/h.