Constant Rate Word Problems

Working alone at a constant rate, Carla can wash a load of dishes in 42 minutes. If Carla works together with Dan and they both work at constant rates, it takes them 28 minutes to wash the same load of dishes. Working at a constant rate, how long would it take Dan to wash the load of dishes by himself?

• 50 minutes

• 1 hour

• 84 minutes

• 2 hours

Working alone, it takes Asanji eight hours to dig a 10 ft by 10 ft hole. Brenda can dig the same hole in nine hours. How long would it take them if they worked together?

• 2 hours

• 4 hours

• 4.24 hours

• 5 hours

It takes Kali eight minutes to sweep a porch. Shawna can sweep the same porch in 11 minutes. If they worked together how long would it take them?

• 4.63 minutes

• 8 minutes

• 5.34 hours

• 6 minutes

It takes Heather seven hours to pour a large concrete driveway. Alberto can pour the same driveway in eight hours. How long would it take them if they worked together?

• 1 hour

• 2.37 hours

• 3.73 hours

• 4 hours

• A

• B

• C

• D

• A

• B

• C

• D

A candlestick burns at a rate of .2 inches per hour.  After 8 hours the candlestick is 13.4 inches tall. 
_{Find the original height of the candle.}

• 15 inches

• 15.6 inches

• 14.8 inches

• 16 inches

At 2 P.M., the level of the water in the pool was 10 feet. At 6 P.M., the level of water was 2 feet. Find the constant rate of change of the water

• -4 feet per hour

• -8 feet per hour

• -2 feet per hour

• -6 feet per hour

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Tags

A.2(C)

• A

• B

• C

• D