Question

МОТОРНАЯ ЛОДКА ПЛЫЛА 1,4 ЧАСА ПО ТЕЧЕНИЮ РЕКИ И 2,2 ЧАСА ПРОТИВ ТЕЧЕНИЯ РЕКИ.КАКОЙ ПУТЬ ПРЕОДОЛЕЛА ЛОДКА ЗА ВСЕ ВРЕМЯ ДВИЖЕНИЯ,ЕСЛИ СКОРОСТЬ ТЕЧЕНИЯ РАВНА 1,7 КМ \Ч,А СОБСТВЕННАЯ СКОРОСТЬ ЛОДКИ-19,8 КМ\Ч

Answer 1

ДАНО

Vc = 19.8

Vt = 1.7

Tпо = 1.4

Тпр = 2,2

НАЙТИ: S = ?

РЕШЕНИЕ

S= (Vc+Vt)*Tпо + (Vc-Vt)*Tпр = (19,8 + 1,7)*1,4 + (19,8 - 1,7)*2,2 =

= 21,5*1,4 + 18,1*2,2 = 30,1 + 39,82 =  69,92 км - весь путь - ОТВЕТ

ДОПОЛНИТЕЛЬНО (и не спрашивали)

Всего от начала старта - вниз 30,1, вверх против течения 39,82 - всего - вверх на 9,72 км вверх по течению.

 

Answer 2

Calculating the Distance Traveled by the Boat

To calculate the distance traveled by the boat, we can use the formula: distance = speed × time.

First, let's calculate the distance traveled with the current and then against the current.

1. Distance Traveled with the Current: - Time = 1.4 hours - Speed of the current = 1.7 km/h - Speed of the boat = 19.8 km/h

Using the formula, distance = speed × time: Distance = 19.8 km/h × 1.4 h = 27.72 km.

2. Distance Traveled against the Current: - Time = 2.2 hours - Speed of the current = 1.7 km/h - Speed of the boat = 19.8 km/h

Using the formula, distance = speed × time: Distance = 19.8 km/h × 2.2 h = 43.56 km.

Total Distance Traveled

To find the total distance traveled by the boat, we can add the distances traveled with and against the current: Total distance = Distance with the current + Distance against the current Total distance = 27.72 km + 43.56 km = 71.28 km.

So, the boat traveled a total distance of 71.28 kilometers during the entire journey.