Question

Sarah can phone a list of people invited to the party in 3 hours. Tyra can phone the same list in 4 hours and David can do it in 5 hours.

how long would it take them to make the phone calls if they work together?
a)6 hours
b)1.3 hours
c)12 hours
d)4 hours​

Answer 1

Answer:

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Answer 2

Answer:

1.3 hours is right answer as 3 person will make calling more easy