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July 23, 2014

July 23, 2014

Posted by **Meghan** on Wednesday, March 24, 2010 at 12:31pm.

Is this how you do this:

t/40 + t/24 =1

t*3/40*3 + t*5/24*5 =1

3t/120 + 5t/120 =1

(8t/120)*120 = 1(120)

8t/8 = 120/8

=15

- Math -
**Reiny**, Wednesday, March 24, 2010 at 4:41pmNo,

rate of first = 1/40

rate of second = 1/20

combined rate = 1/40 + 1/20 = 3/40

so time for job = 1/(3/40) = 40/3 minutes

or 13 1/3 minutes

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