What is happening in part B?
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C They have stopped
Distance-time graph Shows how far from the start something is as time passes.
Speed How far something travels in each hour, minute or second.
How far from home after 1 hour?
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C 30 km
How long is the stop?
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C 1 hour
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C
How far from home is the stop? 40 km
How long is the stop? 1 hour
How far is the whole journey? 80 km
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C Speed = distance ÷ time
Work out the speed
60 km in 2 hours
30 km/h
Work out the speed for part C.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C
Work out the speed for part A.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C
Work out the speed for part A.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C 50 ÷ 2.5 A Time (h) 2.5 Distance (km) 50 Speed (km/h) 20
Show why
Work out the speed for part A.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C A Time (h) 0.5 Distance (km) 20 Speed (km/h) 40
Work out the speed for part A.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C 50 ÷ 2.5 A Time (h) 2.5 Distance (km) 50 Speed (km/h) 20
Show why
Work out the speed for part C.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C C Time (h) 1.5 Distance (km) 30 Speed (km/h) 20
Work out the speed for part A.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C 50 ÷ 2.5 A Time (h) 2.5 Distance (km) 50 Speed (km/h) 20
Show why
Work out the speed for part A.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C A Time (h) 2 Distance (km) 60 Speed (km/h) 30
Work out the speed for part A.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C 50 ÷ 2.5 A Time (h) 2.5 Distance (km) 50 Speed (km/h) 20
Show why
Work out the speed for part C.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C C Time (h) 2 Distance (km) 50 Speed (km/h) 25
Work out the speed for part A.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C 50 ÷ 2.5 A Time (h) 2.5 Distance (km) 50 Speed (km/h) 20
Show why
Work out the speed for part C.
0 1 2 3 4 5 10 20 30 40 50 60 Time (hours) Distance (km) A B C C Time (h) 0.5 Distance (km) 30 Speed (km/h) 60
A journey is 60 km out in 1.5 hours, a 30 minute stop, then 60 km back in 2 hours. Work out the average speed for the whole journey.
30 km/h A cyclist leaves home at 10 am and rides 30 km at 15 km/h. She stops for an hour, then rides home at 20 km/h. What time does she get home?
2:30 pm Two parts of a journey are on the same distance-time graph. Part P rises 45 km in 1.5 hours. Part Q rises 45 km in 3 hours. Which part has the steeper line, and what does that tell you?
P: steeper means faster (30 km/h, not 15 km/h)
The graph shows a journey. How long is the stop in part B? Give your answer in minutes.
30 minutes 0 1 2 3 4 0 10 20 30 40 Time (hours) Distance (km) A B C D Work out the speed in part C.
40 km/h In which part is the speed fastest? Give a reason.
C: the steepest line
Exit tickets to print
