Question

Расстояние между причалами А и В немение 56 км туристы проплыли на моторной лодке от причала А до В и обратно за 3 ч. 45 мин. собственая скорость течение реки 30км/ч а скорость течение реки 2 км/ч оцените за которое время туристы проплыли на моторной лодке по течению от причала до А до причала В

Answer 1

30 + 2 = 32 км/ч - скорость лодки по течению.
56 : 32 = 1,75 ч - плыли от А до В по течению.

Answer 2

Calculating Time to Travel Upstream and Downstream

The distance between the docks A and B is 56 km. The tourists traveled from dock A to B and back in 3 hours and 45 minutes. The speed of the motorboat in still water is unknown, but the speed of the river's current is given as 2 km/h. The speed of the river's current in the opposite direction is 30 km/h.

To calculate the time it took for the tourists to travel from dock A to B and back, we can use the formula: time = distance / speed

First, let's calculate the time it took to travel from dock A to B and back downstream, with the current: time_downstream = distance / (boat_speed + current_speed)

Next, we'll calculate the time it took to travel from dock B to A and back upstream, against the current: time_upstream = distance / (boat_speed - current_speed)

We can then use these calculations to determine the total time taken for the round trip.

Calculating Time Downstream

Using the given values: - Distance = 56 km - Boat speed + current speed = 30 km/h + boat speed We can calculate the time taken to travel downstream.

Calculating Time Upstream

Using the given values: - Distance = 56 km - Boat speed - current speed = boat speed - 2 km/h We can calculate the time taken to travel upstream.

Conclusion

By using the given information and the formulas for calculating time downstream and upstream, we can determine the time it took for the tourists to travel on the motorboat from dock A to B and back.