Distance, speed and time

• Speed


  A rate that compares the distance travelled to the time taken
• Speed of a car


  Measured in kilometres per hour
• Speed readings can also give information about the distance travelled by the vehicle
• Distance, speed and time

  1. D = Distance 2. S = Speed

  3. T = Time
• Example 1


  • Find the distance travelled by a car whose average speed is 65 km/h and the journey lasts 5 hours (answer to nearest kilometer)
• Example 2


  • How long will it take a vehicle to travel 150 m at a speed of 60 km/h
• Solving Example 1


  1. Write the formula D = S x T

  2. Substitute 65 for S and 5 for T into the formula

  3. Evaluate and express answer correct to the nearest kilometer
• Solving Example 2


  1. Write the formula T = D/S

  2. Substitute 150 for D and 60 for S into the formula

  3. Evaluate and give the correct unit