More workers, less time.When else does more ofone thing mean lessof another?
Faster speed, shorter journey
More people sharing, smaller share
More taps, less time to fill
3 workers paint a hall in 8 hours. Each block is one worker for one hour. How many blocks of work is the job?
3 × 8 = 24 blocks
4 workers share the same 24 blocks. How many hours does it take?
24 ÷ 4 = 6 hours
More workers, fewer hours: workers × hours stays 24
A journey takes 4 hours at 30 mph.
It takes 6 workers 4 hours to dig a trench. How long would it take 8 workers? 3 hours
It takes 5 workers 6 hours to tile a floor. How long would it take 3 workers? 10 hours
It takes 4 workers 9 hours to build a wall. How long would it take 6 workers? 6 hours
It takes 2 pumps 15 hours to empty a pond. How long would it take 5 pumps? 6 hours
It takes 9 friends 2 hours to tidy a garden. How long would it take 3 friends? 6 hours
It takes 8 people 3 hours to pick the apples in an orchard. How many people would pick them in 2 hours? 12 people
A car drives 3 hours at 50 mph. The journey back takes 2.5 hours. What was its speed on the way back?
12 painters can paint a school in 10 days. After 4 days, 4 painters leave. How many more days will it take?
6 workers take 10 hours to lay a patio. How long would 4 workers take?
A trip takes 3 hours at 40 mph. How long does it take at 60 mph?
3 taps fill a pool in 8 hours. Ravi says 6 taps would take 16 hours. Is he right? Explain.
