Question

Велосипедист едет по шоссе со скоростью 15км./ч.Сможет ли он за 4ч проехать по проселку 80км? Сможет ли велосипедист проехать 5км за 15 мин?При каких условиях?

Answer 1

1) Чтоб проехать за 4 ч по проселку 80 км, он должен ехать со скоростью 80 : 4 = 20 км/ч. Очевидно, это невозможно, так как ехать по просёлочной дороге, труднее, и скорость будет ниже, чем скорость на шоссе.

2) Сможет ли велосипедист проехать 5 км за 15 мин? 
15 мин = 1/4 часа.
Ему пришлось бы ехать со скоростью 5 : 1/4 = 20 км/ч.  Это возможно, например, если он будет ехать по шоссе с горы, а ветер будет дуть ему в спину :)

Answer 2

15*4=60 (км) проедет велосипедист за 4 ч.
60≥80 значит не успеет

Answer 3

Can a cyclist travel 80 km in 4 hours at a speed of 15 km/h?

To determine if a cyclist can travel 80 km in 4 hours at a speed of 15 km/h, we can use the formula:

Distance = Speed × Time

In this case, the distance is 80 km, the speed is 15 km/h, and the time is 4 hours. Plugging these values into the formula, we get:

80 km = 15 km/h × 4 hours

Simplifying the equation, we find:

80 km = 60 km

Since 80 km is greater than 60 km, the cyclist will be able to travel 80 km in 4 hours at a speed of 15 km/h.

Can a cyclist travel 5 km in 15 minutes?

To determine if a cyclist can travel 5 km in 15 minutes, we can use the formula:

Distance = Speed × Time

In this case, the distance is 5 km, the time is 15 minutes, and we need to find the speed. However, we need to convert the time from minutes to hours, as the speed is given in km/h. There are 60 minutes in an hour, so 15 minutes is equal to 15/60 = 0.25 hours.

Plugging the values into the formula, we get:

5 km = Speed × 0.25 hours

Simplifying the equation, we find:

Speed = 5 km / 0.25 hours = 20 km/h

Therefore, the cyclist would need to travel at a speed of 20 km/h in order to cover a distance of 5 km in 15 minutes.

Under what conditions can a cyclist travel 5 km in 15 minutes?

To travel 5 km in 15 minutes, a cyclist would need to maintain a speed of 20 km/h. This assumes that the cyclist is able to maintain a consistent speed throughout the entire journey and that there are no obstacles or factors that would slow them down.

It's important to note that the actual speed a cyclist can achieve may vary depending on various factors such as terrain, weather conditions, the cyclist's physical condition, and the condition of the bicycle itself. Additionally, traffic conditions and other external factors may also affect the cyclist's ability to maintain a constant speed.

Therefore, in order for a cyclist to travel 5 km in 15 minutes, it would require favorable conditions and the ability to maintain a speed of 20 km/h throughout the entire journey.