Mastering Speed Calculations

John drove his car from his home to a nearby city. The city is 150 kilometers away and it took him 3 hours to reach. Can you calculate the average speed of John's car using the speed formula (Speed = Distance/Time)?

• 45 km/h

• 50 km/h

• 55 km/h

• 60 km/h

Answer explanation

The average speed of the car is calculated by dividing the total distance traveled (150 km) by the total time taken (3 hours). Therefore, the average speed is 50 km/h, which is the correct choice.

John participated in a local marathon. He completed the 5 km race in 0.42 hours. Can you calculate his average speed in km/h using the speed formula (Speed = Distance/Time)?

• 10 km/h

• 12 km/h

• 15 km/h

• 20 km/h

Answer explanation

To calculate average speed, divide the distance by the time taken. In this case, 5 km divided by 0.42 hours equals 11.9 km/h. The correct answer is 12 km/h.

A cyclist is participating in a race. If he maintains an average speed of 30 km/h, how long will it take for him to complete the 120 km race track?

• 2 hours

• 3 hours

• 4 hours

• 6 hours

Answer explanation

At an average speed of 30 km/h, it will take 4 hours for the cyclist to cover a distance of 120 km.

John drives his car at a speed of 90 km/h to reach his office. If he drives for 0.33 hours, how far would he have travelled?

• 15 km

• 18 km

• 30 km

• 45 km

Answer explanation

The train travels at a speed of 90 km/h for 0.33 hours. Therefore, it travels a distance of 29.7 km. The closest answer choice is 30 km, which is the correct choice.

A cyclist travels a distance of 6 km. If his speed was 8 km/h, how long did he take to cover this distance?

• 0.5 hours

• 0.75 hours

• 1 hour

• 1.25 hours

Answer explanation

The jogger runs at a speed of 8 km/h for 0.75 hours, so the distance covered is 6 km. Therefore, the correct answer is 6 km.

Tags

NGSS.MS-PS3-1

A bird is flying from one tree to another. The trees are 5 km apart. If the bird flies at an average speed of 25 km/h, how long will it take to reach the other tree?

• 0.1 hours

• 0.2 hours

• 0.3 hours

• 0.4 hours

Answer explanation

The bird covers a distance of 5 km because it flies at an average speed of 25 km/h for 0.2 hours.

A bus is traveling from city A to city B. The distance between the two cities is 240 km. If the bus completes the journey in 4 hours, can you calculate the average speed of the bus?

• 50 km/h

• 60 km/h

• 70 km/h

• 80 km/h

Answer explanation

The average speed of the bus is calculated by dividing the total distance traveled (240 km) by the total time taken (4 hours). Therefore, the average speed of the bus is 60 km/h, which is the correct choice.

A boat is traveling downstream with an average speed of 15 km/h. If it continues at this speed, how long will it take to cover a distance of 90 km?

• 4 hours

• 5 hours

• 6 hours

• 7 hours

Answer explanation

The boat will take 6 hours to travel 90 km downstream at an average speed of 15 km/h.

John is planning a road trip on his motorbike. He knows that his bike can maintain a constant speed of 80 km/h. He needs to cover a distance of 160 km. Can you help him calculate how long his journey will take?

• 1 hour

• 2 hours

• 3 hours

• 4 hours

Answer explanation

The motorbike travels at a constant speed of 80 km/h. To cover a distance of 160 km, it will take 2 hours, as speed equals distance divided by time.

A race car driver completes a lap of 200 meters in 20 seconds during a practice session. Using the speed formula (Speed = Distance/Time), can you calculate the driver's average speed in meters per second (m/s)?

• 8 m/s

• 10 m/s

• 12 m/s

• 15 m/s

Answer explanation

The sprinter's average speed is calculated by dividing the distance covered (200 meters) by the time taken (20 seconds). Therefore, the average speed is 10 m/s, which is the correct choice.

Tags

NGSS.MS-PS3-1