Question

Реши задачу. Из поселка в город, расстояние между которыми 126 км выехал велосипед со скоростью 18 км/ч. Через 4 часа в том же направлении выехал автобус, который прибыл в город одновременно с велосипедистом. С какой скоростью двигался автобус? Ответь на вопрос: Если бы автобус, и велосипедист выехали одновременно, то на сколько раньше прибыл в город автобус?

Answer 1

126:18=7 т.е. за 7 часов велосипедист приехал из поселка в город.
126:3=42 км/ч скорость автобуса 

Answer 2

Problem Analysis

We are given that the distance between a village and a city is 126 km. A bicycle starts from the village and travels towards the city at a speed of 18 km/h. After 4 hours, a bus starts from the village and arrives at the city at the same time as the cyclist. We need to determine the speed of the bus and how much earlier it would have arrived in the city if both the bus and the cyclist had started at the same time.

Solution

Let's first calculate the time it takes for the cyclist to reach the city.

The formula to calculate time is: time = distance / speed

For the cyclist: distance = 126 km speed = 18 km/h

Substituting the values into the formula, we get: time = 126 km / 18 km/h

Now, let's calculate the time it takes for the bus to reach the city.

We know that the bus starts 4 hours after the cyclist. So, the time for the bus is: time = time for cyclist - 4 hours

Substituting the values, we get: time = (126 km / 18 km/h) - 4 hours

Now, let's calculate the speed of the bus.

We know that the distance traveled by the bus is the same as the distance traveled by the cyclist, which is 126 km. So, the speed of the bus is: speed = distance / time

Substituting the values, we get: speed = 126 km / [(126 km / 18 km/h) - 4 hours]

Let's calculate the values.

Calculation

The time for the cyclist is: time = 126 km / 18 km/h = 7 hours

The time for the bus is: time = 7 hours - 4 hours = 3 hours

The speed of the bus is: speed = 126 km / (7 hours - 4 hours) = 126 km / 3 hours = 42 km/h

Answer

The speed of the bus is 42 km/h.

If the bus and the cyclist had started at the same time, the bus would have arrived in the city 4 hours earlier.

Please let me know if there is anything else I can help you with.