Sample quiz on rates
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1. A rate is $\cdots$?
   
   a comparison of two quantities with different units
   a comparison of two quantities with the same units
   a sum of two quantities measured in the same units
   a product of two quantities measured in the same units
   
2. Which of these is an example of a rate?
   
   speed
   distance
   time
   temperature
3. Every week, a man makes $\$800$ after working for $40$ hours. His hourly wage is $\cdots$?
   
   $\$60$/hour
   $\$40$/hour
   $\$20$/hour
   $\$15$/hour
4. If only money is considered, which of these two pays better: $\$400$ for $25$ hours or $\$300$ for $20$ hours?
   
   $\$400$ for $25$ hours
   $\$300$ for $20$ hours
   none of them
   not sure
5. A car travels $120$ km in $90$ minutes. What is its speed?
   
   $\frac{120}{90}$ km/hour
   $75$ km/hour
   $\frac{1}{80}$ km/hour
   $80$ km/hour
6. A car travels at $75$ km/hour. How long will it take to cover a distance of $300$ km?
   
   $2$ hours
   $4$ hours
   $6$ hours
   $8$ hours
7. Two-thirds of a certain job can be completed in $24$ minutes. How long will it take to complete the entire job working at the same rate?
   
   $24$ minutes
   $30$ minutes
   $36$ minutes
   $42$ minutes.
8. Water leaks from a tank at a rate of $0.5$ litres per minute. At this rate, how long will it take to empty the entire $150$ L tank?
   
   $7.5$ minutes
   $7.5$ hours
   $5$ minutes
   $5$ hours
9. A man's hourly wage is $\$25$/hour. For how many hours should he work in order to earn $\$500$?
   
   $50$ hours
   $40$ hours
   $20$ hours
   $10$ hours
10. If one-fifth of a job can be completed in $20$ minutes, how long will it take to complete the entire job, working at the same rate?
    
    $20$ minutes
    $25$ minutes
    $100$ minutes
    $120$ minutes