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A certain hotel has 1,400 single rooms and 420 double rooms.

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A certain hotel has 1,400 single rooms and 420 double rooms. [#permalink] New post 30 Nov 2005, 09:41
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A certain hotel has 1,400 single rooms and 420 double rooms. Each room is cleaned by one person. If one person can clean a single room every 15 mins and a double room every 20 minutes, how many cleaning persons are needed to clean all of the rooms if each person works for exactly 7 hours?
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Re: PS rates? [#permalink] New post 30 Nov 2005, 10:04
joemama142000 wrote:
A certain hotel has 1,400 single rooms and 420 double rooms. Each room is cleaned by one person. If one person can clean a single room every 15 mins and a double room every 20 minutes, how many cleaning persons are needed to clean all of the rooms if each person works for exactly 7 hours?


Is it 70?

total number of Hours required to clean all the rooms=
1400 * 15/60 + 420 * 20/60
=490 hrs

If one person only spends 7 hrs then 70 people will be required, provided they do not go to lunch in between or go for a bio break.
Re: PS rates?   [#permalink] 30 Nov 2005, 10:04
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A certain hotel has 1,400 single rooms and 420 double rooms.

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