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Jaya can flip 40 pancakes per minute, whereas Sally

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Jaya can flip 40 pancakes per minute, whereas Sally [#permalink] New post 19 Aug 2017, 08:05
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Question Stats:

50% (01:39) correct 50% (02:59) wrong based on 6 sessions


Jaya can flip 40 pancakes per minute, whereas Sally works at half Jaya's rate. How many minutes will it take the two of them to flip 150 pancakes, if Sally flips the first 30 by herself and is then joined by jaya for the remainder?

enter your value as a decimal

[Reveal] Spoiler: OA
3.5

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Re: Jaya can flip 40 pancakes per minute, whereas Sally [#permalink] New post 30 Sep 2017, 05:52
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If Jaya's rate is 1/40, Sally's rate is 1/20, double Jaya's rate.

Then, to compute the time spent in making 150 pancakes, we need Jaya and Sally's combined rate that is 1/60.

Thus, the answer is given by 30*1/20 + 120*1/60 = 7/2 = 3.5
Re: Jaya can flip 40 pancakes per minute, whereas Sally   [#permalink] 30 Sep 2017, 05:52
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Jaya can flip 40 pancakes per minute, whereas Sally

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