8.3 Calculation of Speed

8.3 Calculation of Speed

Learning Goals

• Level 1: Identify which speed is faster or slower

• Level 2: Given 2 out of the 3 factors, calculate distance, time or speed

Multiple Choice

Tom ran for 2 hours while Sam ran for 3 hours.

Is it fair to say that Tom ran faster?

• Fair

• Unfair

• Cannot conclude

Explanation

Tom can run 1km in 2 hours.

Sam can run 10km in 3 hours

We need to calculate speed to tell us who ran faster when we consider their distance travelled per unit time (per second, per minute, per hour)

Fill in the Blanks

Kelvin leaves home at 8.45am and travels to work at an average speed of 40km/h. He arrives at work at 9.05am. How far is it from Kelvin's home to his work?

km

Fill in the Blanks

A car travels 2.5 hours at 60km/h. It then travels for 3 hours at 55km/h. Find the average speed for the whole journey. (leave your answer in 3.s.f)