Question 935518
r = w/t
t = w/r
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rates are additive:
r = 1/12 + 1/10
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t = 1/r
t = 1(1/12 + 1/10)
t = 1(10/120 + 12/120)
t = 1(22/120)
t = 120/22
t = 5.45454545455
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answer:
about 5.5 hours
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