# math

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Frank can type a report in 4 hours and James takes 6 hours. How long will it take the two of them typing together?

• math -

• correction - math -

Frank's rate = 1/4
James rate = 1/6
combined rate = 1/4 + 1/6 = 5/12

time at combined rate = 1/(5/12)
= 12/5
= 2.4 hours

• math -

290*484-59385\6853]3763]= 1480264095740

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