Which example has the greatest speed? A boat sailing 80 km in 2 hours, a car driving 90 km in 2 hours, a train traveling 120 km in 3 hours, or a truck moving 50 km in 1 hour.

Steps to Solve

1. Calculate the speed of the boat

The speed is calculated using the formula:

$$ \text{Speed} = \frac{\text{Distance}}{\text{Time}} $$

For the boat sailing 80 km in 2 hours:

$$ \text{Speed}_{\text{boat}} = \frac{80 \text{ km}}{2 \text{ hours}} = 40 \text{ km/h} $$

2. Calculate the speed of the car

Using the same formula for the car driving 90 km in 2 hours:

$$ \text{Speed}_{\text{car}} = \frac{90 \text{ km}}{2 \text{ hours}} = 45 \text{ km/h} $$

3. Calculate the speed of the train

For the train traveling 120 km in 3 hours:

$$ \text{Speed}_{\text{train}} = \frac{120 \text{ km}}{3 \text{ hours}} = 40 \text{ km/h} $$

4. Calculate the speed of the truck

For the truck moving 50 km in 1 hour:

$$ \text{Speed}_{\text{truck}} = \frac{50 \text{ km}}{1 \text{ hour}} = 50 \text{ km/h} $$

5. Compare the speeds

Now we compare the calculated speeds of all four:

• Speed of the boat: 40 km/h
• Speed of the car: 45 km/h
• Speed of the train: 40 km/h
• Speed of the truck: 50 km/h

The highest speed can be identified from these values.