Distance, Speed and Time

 

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Distance travelled, average speed maintained and time elapsed are related by the following:

2

 

or, as used in Science classes

3

 

Remember : Converting time units

Times decimal of hour by 60 to  get minutes:
1.15hrs means 1hr 9 minutes, not 1 hr 15 minutes

Divide minutes by 60 to get decimal of hour: 
3hrs 45 minutes  = 3.75 hours , not 3.45 hours

 

Distance travelled

6

Examples

A man walks for 3 hours at a speed of 3 miles per hour.
How far has he travelled ?

5

1

 

A man walks for 45 minutes at a speed of 4 miles per hour.
How far has he travelled ?

6

Convert the minutes into hours :

2

so

3

      

 

Average Speed maintained

5

 

Examples

A man covers a distance of 21 miles in 7 hours.
Calculate his average speed.

7

4

 

A man covers a distance of 232 miles in 7 hours and 15 minutes.
What was his average speed ?

8

Convert the minutes into hours :

9

so

10

 

Time taken

4

 

Examples

How long does it take an aircraft  travelling at 580 km per hour to travel a distance of 232 kilometres ?

13

11

convert to minutes

12

 

A man drove a distance of 250 miles at an average speed of 70 mph.
How long did the journey take ?
Give your answer in hours, minutes and seconds.

14

15

convert to minutes

16

convert to seconds

17

 

DST graphs

 

© Alexander Forrest