Question

Автомобилист заметил что со скоростью 60 км ч он проехал мост через реку за 40 секунд на обратном пути он проехал это же мой за 30 секунд Определите скорость автомобиля на обратном пути

Answer 1

1)60*0.4=24(км)-Sмоста
2)24:0.3=80(км/ч)-Vна обратном пути

Answer 2

Calculation of the Car's Speed on the Return Trip

To determine the speed of the car on the return trip, we can use the formula:

Speed = Distance / Time

Let's denote the speed of the car on the forward trip as v (in km/h), the distance of the bridge as d (in km), and the time taken to cross the bridge on the forward trip as t1 (in seconds). Similarly, let's denote the time taken to cross the bridge on the return trip as t2 (in seconds).

From the given information, we have:

- Speed on the forward trip: v = 60 km/h - Time taken to cross the bridge on the forward trip: t1 = 40 seconds - Time taken to cross the bridge on the return trip: t2 = 30 seconds

To find the distance of the bridge, we can use the formula:

Distance = Speed × Time

Using this formula, we can calculate the distance of the bridge for both the forward and return trips.

For the forward trip: d = v × t1

For the return trip: d = v × t2

Now, let's substitute the given values into the formulas to calculate the distance of the bridge for both trips.

For the forward trip: d = 60 km/h × 40 seconds

For the return trip: d = 60 km/h × 30 seconds

To calculate the speed of the car on the return trip, we need to find the time taken to cross the bridge on the return trip. We can rearrange the formula for distance to solve for time:

Time = Distance / Speed

Using this formula, we can calculate the time taken to cross the bridge on the return trip.

For the return trip: t2 = d / v

Now, let's substitute the calculated distance and the given speed into the formula to calculate the time taken to cross the bridge on the return trip.

For the return trip: t2 = (60 km/h × 30 seconds) / 60 km/h

Simplifying the expression, we find:

t2 = 30 seconds

Therefore, the speed of the car on the return trip is 60 km/h.