Question

Моторная лодка спустилась вниз по течению реки на 18 км и вернулась обратно,затратив на весь путь 1 час 45 минут. Какова скорость течения реки ,если собственная скорость лодки 21 км/ч?

Answer 1

36/1*3/6 = 36*6/9 = 24 (средняя скорость)

21 + x = 24

x = 24 - 21 = 3 km/h

 

 

Answer 2

18*1ч45мин/21=1.3км/ч скорость течения реки

Answer 3

Calculation of River Current Speed

To calculate the speed of the river current, we can use the formula:

Speed of the river current = Total distance traveled / Total time taken

In this case, the total distance traveled is 18 km (as the boat went downstream and then returned upstream), and the total time taken is 1 hour and 45 minutes.

To calculate the total time taken in hours, we need to convert the 45 minutes to hours. Since there are 60 minutes in an hour, 45 minutes is equal to 45/60 = 0.75 hours.

Now we can calculate the speed of the river current:

Speed of the river current = 18 km / 1.75 hours

Calculating this, we find that the speed of the river current is approximately 10.29 km/h.

Please note that this calculation assumes that the boat traveled at a constant speed throughout the journey and that there were no other factors affecting the boat's speed or the river current.