Question

Собственная скорость катера 15 целых одна вторая км/час скорость течения реки2 целых одна четвёртая км/час 1)За какое время проплывёт катер 71 км если будет плыть по течению реки? 2)за какое время катер проплывёт 71 целую одну вторую км ? ПОМОГИТЕ ПОЖАЛУЙСТА!!!!!!!!!

Answer 1

15 1/2=15,5
2 1/4=2,25
15,5+2,25=17,75км/ч скорость катера по течению
71:17,75=4ч-время за которое катер проплывет 71км по тичению
15,5-2,25=13,25км/ч скорость катера против течения
71:13,25=5 19/53ч-время за которое катер проплывет 71км против течения

Answer 2

Скорость по теч.реки=15,5+2,25=17,75(км/ч)
1)71:17,75=4(ч)-за такое время катер проплывет 71 км по течению реки
2)непонятна формулировка,но если тоже по течению реки,то 71,5:17,75=143/69(ч)

Answer 3

Calculation of Time to Travel 71 km with the River Current

To calculate the time it takes for the boat to travel 71 km with the river current, we need to consider the boat's speed and the speed of the river current.

Given: - Boat speed: 15 1/2 km/h - River current speed: 2 1/4 km/h

To find the time it takes for the boat to travel 71 km with the river current, we can use the formula:

Time = Distance / Speed

1) Time to travel 71 km with the river current: - Distance: 71 km - Speed of the boat with the river current: 15 1/2 km/h + 2 1/4 km/h = 17 3/4 km/h

Using the formula, we can calculate the time:

Time = 71 km / 17 3/4 km/h

To simplify the calculation, we can convert the mixed numbers to improper fractions:

Time = 71 km / (71/4) km/h

Now, we can divide the numerator by the denominator:

Time = 71 km * (4/71) h

Simplifying further, we get:

Time = 4 hours

Therefore, it will take the boat approximately 4 hours to travel 71 km with the river current.

Calculation of Time to Travel 71 1/2 km

To calculate the time it takes for the boat to travel 71 1/2 km, we need to consider the boat's speed.

Given: - Boat speed: 15 1/2 km/h

To find the time it takes for the boat to travel 71 1/2 km, we can use the formula:

Time = Distance / Speed

2) Time to travel 71 1/2 km: - Distance: 71 1/2 km - Speed of the boat: 15 1/2 km/h

Using the formula, we can calculate the time:

Time = 71 1/2 km / 15 1/2 km/h

To simplify the calculation, we can convert the mixed numbers to improper fractions:

Time = (143/2) km / (31/2) km/h

Now, we can divide the numerator by the denominator:

Time = (143/2) km * (2/31) h

Simplifying further, we get:

Time = 143/31 hours

Therefore, it will take the boat approximately 143/31 hours to travel 71 1/2 km.

Please note that the above calculations are based on the given information and assume constant speeds throughout the journey.