1. Time Distance Speed Calculations
Distance = Speed × Time
Units of Measure:
Time:
Hours
Minutes
There are 60 minutes in an hour so convert these times in
minutes to hours (in decimal notation).
Minutes to hours
Hours to minutes
Write as a fraction compared
with 60 minutes (in an hour)
Multiply by 60 30 60
30 minutes
= 0.5 hrs
2 hours
2× 60
= 120 mins 15 60
15 minutes
= 0.25 hrs
0.75 hours
0.75× 60
= 45 mins

2. Time Distance Speed Calculations
Distance = Speed × Time
Units of Measure:
Distance:
Kilometres
Miles
Metres
Means ÷
Speed:
Kilometres per hour
km/hr
km/hr
Miles per hour
miles/hr
Metres per second
m/s
The calculation is given by the units of measure
Distance
Time
Speed =

3. Time Distance Speed Calculations
Distance = Speed × Time
D = S × T
Use this formula to find the distances for:
20 miles per hour for 2 hours
60 miles per hour for 4 hours
40 kmph for 30 minutes
80 miles per hour for 15 minutes
42 km per hour for 10 minutes
20 × 2
40 miles
60 × 4
240 miles
40 × 30 60
20 km
80 × 15 60
20 miles
42 × 10 60
7 km

4. Time Distance Speed Calculations
Distance = Speed × Time
Using what we have learnt from rearranging equations If D = S × T
then D = S × T
and D = S × T

5. Time Distance Speed Calculations
Speed = Distance
Time
Use this formula to find :
A train travels 240 km in 4 hours
What is its average speed?
A plane flies over two cities that are 63 miles apart.
The journey takes 7 minutes. What is its average speed?
Answer in miles per minute
3. An athlete can run 100 metres in 12 seconds. Calculate the
athlete’s speed.
Answer in metres per second and 1 d.p.
A cheetah took 6 seconds to run 150m. How fast did it run?
Answer in metres per second
240 4
= 60 km per hour 63 7
= 9 miles per minute
100 12
= 8.3 m per second
150 6
= 25 m per second

6. Time Distance Speed Calculations
Use this formula to find :
A man ran 400 m at an average speed of 8 m/s
How long did he take?
A coach travels 120 miles at an average speed of 40 mph.
How long did it take?
A walker travels a distance of 3 km at a steady speed of 4km.
Find how long he takes in minutes.
A cyclist travelled 6 km at 18 kmph.
400 8
= 50 seconds
120 40
= 3 hours 3 4
= 0.75 hrs
0.75× 60
= 45 mins
= 0.3 hrs .
0.3× 60 . 6 18
= 20 mins

7. Time Distance Speed Calculations
A delivery van sets off at 07:45 to deliver a package 20 miles
from the store. It arrives at the customer at 08:10
Calculate the van’s average speed in miles per hour
The van’s average speed on the return journey is 25 mph.
b) How long does the return journey take?
Give your answer in minutes.
c) Calculate the van’s average speed for the whole journey. 25 60
= hrs 20
0.4167
= 48 miles per hour 20 25
= 0.8 hrs
0.8× 60
= 48 mins
40 miles for ( ) = 73 minutes 73 60
= hrs 40
1.2167
= 32.9 miles per hour