time duration and elapse

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

Tags

CCSS.HSA.CED.A.1

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

Tags

CCSS.HSA.CED.A.1

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

Tags

CCSS.HSA.CED.A.1

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

Tags

CCSS.HSA.CED.A.1

Working alone, it takes Stephanie seven hours to clean an attic. Shayna can clean the same attic in 12 hours. Find how long it would take them if they worked together.

• 4.42 hours

• 4 hours

• 3.24 hours

• 3 hours

Tags

CCSS.HSA.CED.A.1

Sally and Dan were able to paint a room in 3 hours together. It takes Dan 4 hours to do this job alone. Without help, how long would it take Sally to do this job ?

• 11 hous

• 12.54 hours

• 12 hours

• 13 hours

Tags

CCSS.HSA.CED.A.1

It takes Darryl nine hours to mop a warehouse. Castel can mop the same warehouse in eight hours. Find how long it would take them if they worked together.

• 3.12 hours

• 4 hours

• 4.13 hours

• 4.24 hours

Tags

CCSS.HSA.CED.A.1

Working alone, Shanice can tar a roof in 12 hours. One day her friend Kathryn helped her and it only took 5.14 hours. How long would it take Kathryn to do it alone?

• 8 hours

• 8.13 hours

• 8.50 hours

• 8.99 hours

Tags

CCSS.HSA.CED.A.1

Nicole can pick forty bushels of apples in 15 hours. Carlos can pick the same amount in 11 hours. How long would it take them if they worked together?

• 6.35 hours

• 6.17 hours

• 6.09 hours

• 6 hours

Tags

CCSS.HSA.CED.A.1

Working together, Arjun and Maria can oil the lanes in a bowling alley in 4.24 hours. Had she done it alone it would have taken Maria eight hours. How long would it take Arjun to do it alone?

• 9 hours

• 9.02 hours

• 9.42 hours

• 10 hours

Tags

CCSS.HSA.CED.A.1