Changing Times

Practise converting times from one unit to another

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This is level 8: Rates that force time conversions (speed, flow, pay and download rate problems) and multi-step conversions with rounding..

Click on the question marks in circles to get a hint and information about the format of your answer.

1

A car travels at 90 km/h. How many kilometres does it travel in 30 minutes?

90 km/h means the car travels 90 kilometres is one hour.
Type your answer in this format:
" km"

2

A runner runs at 12 km/h. How far in 15 minutes?

15 minutes is a quarter of an hour
Type your answer in this format:
" km"

3

Convert 2.4 hours into hours and minutes.


Type your answer in this format:
" hours minutes"

4

A tap fills a bucket at 3 litres per minute. How many litres in 45 seconds?


Type your answer in this format:
". litres"

5

You earn £12.60 per hour. How much is that in pence per minute?


Type your answer in this format:
" pence per minute"

6

Convert 5 m/s into km/h.

Do this calculation in two steps. Convert 5 m/s into km/s then convert that answer to km/h
Type your answer in this format:
" km/h"

7

Convert 72 km/h into m/s.


Type your answer in this format:
" m/s"

8

A file downloads at 8 MB/s. How many MB in 2.5 minutes?


Type your answer in this format:
" MB"

9

A cyclist travels 18 km in 45 minutes. What is the average speed in km/h?


Type your answer in this format:
" km/h"

10

A heart rate is 84 beats per minute. About how many beats in 15 seconds?


Type your answer in this format:
" beats"

11

Water flows at 0.35 litres per second. How many litres in 2 minutes 30 seconds?


Type your answer in this format:
". litres"

12

Convert 3 hours 17 minutes into decimal hours (to 2 d.p.).


Type your answer in this format:
". hours"

13

Convert 0.0833 hours into minutes (nearest minute).


Type your answer in this format:
" minutes"

14

Convert 125 seconds into decimal minutes (to 3 d.p.).


Type your answer in this format:
". minutes"

15

Convert 1.975 hours into h:min:s (nearest second).


Type your answer in this format:
"::"

16

A meeting lasts 1 hour 47 minutes. Write this in decimal hours (to 3 d.p.).


Type your answer in this format:
". hours"

17

Write 3.1416 hours as hours and minutes (nearest minute).


Type your answer in this format:
" hours minutes"

18

Convert 0.48 days into hours and minutes (nearest minute).


Type your answer in this format:
" hours minutes"

19

A digital timer shows that a coach journey takes 2:39:45. Write this time in hours as a decimal (to three significant figures).


Type your answer in this format:
". hours"

20

There are 8 furlongs in a mile. A fortnight is two weeks. Convert the speed of eighty thousand furlongs per fortnight to mph (to the nearest whole number).


Type your answer in this format:
" mph"

Check

Can you correct your mistakes in order to get full marks?

This is Changing Times level 8. You can also try:
Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7

Instructions

Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.

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Description of Levels

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Level 1 - Seconds and minutes (whole-number conversions).

Level 2 - Seconds and decimal minutes (convert seconds to decimal minutes and decimal minutes to seconds).

Level 3 - Minutes and hours (whole-number conversions, including hours and minutes).

Level 4 - Minutes and decimal hours (convert minutes to decimal hours and decimal hours to minutes).

Level 5 - Mixed time formats (convert between h:min:s and a single unit such as minutes or seconds).

Level 6 - Timetables and everyday timing (use conversions in simple real-life situations and finish-time questions).

Level 7 - Days, weeks, months and years (convert between hours, days and weeks etc., including decimal forms).

Level 8 - Rates that force time conversions (speed, flow, pay and download rate problems) and multi-step conversions with rounding.

More on Time including lesson Starters, visual aids, investigations and self-marking exercises.

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Example

You may also want to use a calculator to check your working. See Calculator Workout skill ##.

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