German High School

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

Answers

Answer 1

3.8 hours but I am not sure

Answer 2

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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