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

or, as used in Science classes

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

Examples

A man walks for 3 hours at a speed of
3 miles per hour.

How far has he travelled ?

A man walks for 45 minutes at a speed of
4 miles per hour.

How far has he travelled ?

Convert the minutes into hours :

so

Examples

A man covers a distance of 21 miles in
7 hours.

Calculate his average speed.

A man covers a distance of 232 miles in
7 hours and 15 minutes.

What was his average speed ?

Convert the minutes into hours :

so

Examples

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

convert to minutes

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.

convert to minutes

convert to seconds

DST graphs