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January 25, 2015

January 25, 2015

Posted by **Valentine** on Thursday, April 21, 2011 at 4:03pm.

- alegbra -
**Henry**, Friday, April 22, 2011 at 9:38pm1/t= 1/4 + 1/5,

1/t = 5/20 + 4/20 = 9/20,

t = 20/9 = 2.2 hours.

Or

t = 4*5 / (4+5) = 20/9 = 2.2 hours.

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