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one student can paint a wall in 10 minutes. another student can paint the same wall in 15 min. working together, how long will it take for them to paint the wall

Respuesta :

jcherry99

Answer:

6 minutes

Step-by-step explanation:

Formula

1/15 + 1/10 = 1 / x where x is the time it takes both of them to do the job.

Solution

The lowest common denominator for 1/15 and 1/10 is 30

2/30 + 3/30 = 1/x

5/30 = 1/x              Cross multiply

5x = 30                  Divide by 5

5x / 5 = 30/5

x = 6

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