Posted by Anonymous on Tuesday, October 2, 2012 at 7:55pm.
A boy can rake a yard in 2.5 hours, his sister can rake it in 4 hours. How long will it take both of them to rake it?

Math  Ms. Sue, Tuesday, October 2, 2012 at 7:57pm
Reiny answered this.
http://www.jiskha.com/display.cgi?id=1349221382

Math  bobpursley, Tuesday, October 2, 2012 at 7:58pm
In 40 hours, he can rake 16 yards, she can rake 10, so both can rake 26 in 40 hours, or rate=25/40 yards/hr. Reduce that fraction to a decimal.
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