K12 6th Grade Math 1.07 Constant Rate Problems

Some students washed 24 cars in 2 hours.

How many cars can they wash in 15 hours?

• 12

• 48

• 180

• 369

A trucking company makes 50 deliveries in 5 days.

How long will it take for 400 deliveries?

• 8 days

• 10 days

• 20 days

• 40 days

An automated car wash can wash 30 cars in 5 hours.

How long would it take to wash 120 cars?

• 15 h

• 20 h

• 25 h

• 30 h

A pipe can pump 1000 gallons of water in 4 hours.

How long would it take the pipe to fill a 2500 gallon pool?

• 4 h

• 8 h

• 10 h

• 25 h

The office worker can stamp 25 letters per minute.

At that rate, how many letters can the worker stamp in 5 minutes?

• 5 letters

• 20 letters

• 100 letters

• 125 letters

A farmer can pick 12 boxes of apples per day.

At that rate, how many boxes can the farmer pick in 45 days?

• 57 boxes

• 450 boxes

• 540 boxes

• 600 boxes

A worker at a computer factory can assemble 8 computers per hour.

How long would it take this worker to assemble 200 computers?

• 8 h

• 20 h

• 25 h

• 200 h

An automobile assembly line can produce 3 cars per hour.

How long would it take this assembly line to produce 150 cars?

• 5 h

• 30 h

• 45 h

• 50 h

A house painter can paint 2550 square feet in 3 hours.

What is the house painter’s painting rate?

• 550 ft²/h

• 850 ft²/h

• 1700 ft²/h

• 7650 ft²/h

Rosa can till 375 square feet of land in 15 minutes.

What is Rosa’s tilling rate?

• 15 ft²/min

• 25 ft²/min

• 150 ft²/min

• 250 ft²/min