Question

Речку можно переплыть от берега до берега за 4 минуты,если плыть со скоростью 90м\мин.сколько времени потребуется для этого Оле,если она будет плыть со скоростю 60м\мин ? 45м\мин?

Answer 1

90.4=360км                                                                                                             360разделить на 60=6мин                                                                                    360 разделиь на 45=8мин 

Answer 2

Calculation of Time Required for Crossing the River

To calculate the time required for crossing the river, we can use the formula:

Time = Distance / Speed

Given that the river can be crossed from one bank to the other in 4 minutes with a speed of 90 m/min, we can calculate the distance using the formula:

Distance = Speed × Time

Substituting the given values, we have:

Distance = 90 m/min × 4 min = 360 meters

Now, let's calculate the time required for Olga to cross the river at different speeds.

1. Olga's Speed: 60 m/min - Distance: 360 meters - Time = Distance / Speed = 360 meters / 60 m/min = 6 minutes

2. Olga's Speed: 45 m/min - Distance: 360 meters - Time = Distance / Speed = 360 meters / 45 m/min = 8 minutes

Therefore, if Olga swims at a speed of 60 m/min, it will take her 6 minutes to cross the river, and if she swims at a speed of 45 m/min, it will take her 8 minutes to cross the river.

Please note that these calculations assume a constant speed throughout the crossing and do not take into account any other factors that may affect the time required, such as the current or obstacles in the river.

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