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If it takes Laine 3 hours to wash the windows of one house, Leslie 4 hours to wash the same windows, and Lance 5 hours to wash the same windows, how long would it take them all working together to wash the windows on THREE houses? 3.8 hours 2.6 hours 5 hours 0.08 hours

Respuesta :

beauty2009

3.8 hours but I am not sure

The time taken to take them all working together to wash the windows on three houses is D. 0.8 hours.

How to calculate the time?

The time taken by both of them will be:

1/4 + 1/5 + 1/3= x

15/60 + 13/60 + 20/60

48/60 = x

Cross multiply

48x = 60

x = 48/60

x = 0.8 hours.

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