← Aptitude for placements
Lesson 4 of 5
Time and work
Watch, read the card, then practise. Work per day · Working together
The video for this lesson is being recorded.
Meanwhile, the notes below and the 60-second cards cover the same ideas.
Practise this topicWork per day
If a job takes n days, you do 1/n of it each day. Working with rates makes these sums easy.
Remember: Turn every time into a rate (job per day).
Working together
When people work together, add their rates. The time is 1 ÷ (total rate).
Remember: Add rates, never add days.