Question 191642
Andrea can rake her Dad's yard in 45 minutes. Andrea's brother Bradford rakes one and one-half times faster than Andrea. How long would it take them to rake their Dad's yard together?
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1.5 times faster is 2.5 times as fast, not 1.5 times as fast.
So Bradford can rake the yard in 45/2.5 minutes, or 18 minutes, alone.
Right?  If not, is "1 times faster" the same speed?  If it's the same speed, then why say "faster?"
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The time working together is (using a math shortcut)
45*18/(45+18)
= 90/7 minutes, or apx 12.86 minutes.