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# rate question...i think

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Intern
Joined: 26 Jan 2009
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Schools: University of Toronto, Schulich, Western, Queens
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rate question...i think [#permalink]  11 Apr 2009, 14:48
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(N/A)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
????????
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Re: rate question...i think [#permalink]  11 Apr 2009, 16:21
Expert's post
You'll certainly fill the bucket faster with both taps on than you will just using one tap, so t < c < h must be true. So I) is definitely true, and II) is definitely false. Now, c/2 is the time it would take two cold taps to fill the bucket. We don't have two cold taps -- we have one cold tap, and one slower tap. So t > c/2. Similarly, h/2 is how long it would take two hot taps. We don't have two hot taps -- we have one hot tap, and one faster tap. So t < h/2. So III) must also be true.
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Re: rate question...i think [#permalink]  11 Apr 2009, 17:57
thanks....it makes sense now
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Re: rate question...i think [#permalink]  11 Apr 2009, 18:55
There is one more way to solve this ques.. though a bit tedious..
t= ch /c+h. put h =3 and c =2. It gives Option I and III to be correct.
Re: rate question...i think   [#permalink] 11 Apr 2009, 18:55
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