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# One pipe can fill a tank in 1 hour, while another pipe can fill the sa

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Math Expert
Joined: 02 Sep 2009
Posts: 59622
One pipe can fill a tank in 1 hour, while another pipe can fill the sa  [#permalink]

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20 Nov 2019, 01:15
00:00

Difficulty:

5% (low)

Question Stats:

88% (00:52) correct 12% (01:28) wrong based on 34 sessions

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One pipe can fill a tank in 1 hour, while another pipe can fill the same tank in 2 hours. How long will it take to fill the tank if both pipes are used together?

A. 2/3 hour
B. 1/3 hour
C. 1 hour
D. 4/5 hour
E. 3/4 hour

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Posts: 5466
Location: India
Concentration: Sustainability, Marketing
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WE: Marketing (Energy and Utilities)
Re: One pipe can fill a tank in 1 hour, while another pipe can fill the sa  [#permalink]

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20 Nov 2019, 01:25
Bunuel wrote:
One pipe can fill a tank in 1 hour, while another pipe can fill the same tank in 2 hours. How long will it take to fill the tank if both pipes are used together?

A. 2/3 hour
B. 1/3 hour
C. 1 hour
D. 4/5 hour
E. 3/4 hour

ra=1/1
rb=1/2
together = 1/1+1/2 ; 3/2 time ; 2/3 hour
IMO A
Intern
Joined: 08 Jan 2019
Posts: 4
One pipe can fill a tank in 1 hour, while another pipe can fill the sa  [#permalink]

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21 Nov 2019, 06:50
P1 = 1 job in 1 hour = 1/1
p2 = 1 job in 2 hours= 1/2
2/2 + 1/2 = 3/2 time = 2/3 hours

IMO - A
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Re: One pipe can fill a tank in 1 hour, while another pipe can fill the sa  [#permalink]

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24 Nov 2019, 07:21
Bunuel wrote:
One pipe can fill a tank in 1 hour, while another pipe can fill the same tank in 2 hours. How long will it take to fill the tank if both pipes are used together?

A. 2/3 hour
B. 1/3 hour
C. 1 hour
D. 4/5 hour
E. 3/4 hour

The combined rate is:

1/1 + 1/2 = 2/2 + 1/2 = 3/2.

So the time would be job/rate = 1/(3/2) = 2/3.

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Re: One pipe can fill a tank in 1 hour, while another pipe can fill the sa   [#permalink] 24 Nov 2019, 07:21
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