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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:

66% (01:03) correct 33% (05:04) wrong based on 15 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
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Re: Jaya can flip 40 pancakes per minute, whereas Sally [#permalink] New post 17 Apr 2019, 01:29
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Simple logic can save time here instead of using formulas or any long arithematic.

Jaya flips 40 in a min
Sally can flip 20 in a min

when sally flips first 30 pancakes she takes 1.5 mins. Now 120 remain to be flipped when jaya joins in. when both work for 1 min they together can flip 60 pancakes. 40 Jaya and 20 Sally. So they need 1 more min to flip 60 more. So in 2 mins they together flip 120 pancakes. Now Sally flips first 30 in 1.5 mins so total time they take is 3.5 mins
Re: Jaya can flip 40 pancakes per minute, whereas Sally   [#permalink] 17 Apr 2019, 01:29
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Jaya can flip 40 pancakes per minute, whereas Sally

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