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Updated on: 10 Jul 2019, 04:46
Originally posted by Bunuel on 14 Apr 2019, 04:18.
Last edited by Sajjad1994 on 10 Jul 2019, 04:46, edited 1 time in total.
Last edited by Sajjad1994 on 10 Jul 2019, 04:46, edited 1 time in total.
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A
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Difficulty:
5%
(low)
Question Stats:
87% (01:08) correct
13%
(01:36)
wrong
based on 188
sessions
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A tank is being drained at a constant rate. If it takes 3 hours to drain 6/7 of its capacity, how much longer will it take to drain the tank completely?
(A) 1/2 hour
(B) 3/4 hour
(C) 1 hour
(D) 3/2 hours
(E) 2 hours
(A) 1/2 hour
(B) 3/4 hour
(C) 1 hour
(D) 3/2 hours
(E) 2 hours
Source: Nova GMAT
Difficulty Level: 550
Difficulty Level: 550
14 Apr 2019, 04:26
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Bunuel
Assume the capacity of the tank to be 70 units.
It is given that \(\frac{6}{7}\)th of the tank(60 units) is drained at 3 hours. Rate of draining is \(\frac{60}{3} = 20\) units/hour.
Therefore, the remaining tank(10 units) will drain completely in \(\frac{10}{20}\) or \(\frac{1}{2}\) hour(Option A).
Archit3110
Major Poster
14 Apr 2019, 04:47
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Bunuel
let tank total capacity = 14 ltrs
so 6/7 *14= 12 ltrs
in 3 hrs its rate = 4ltrs per hr
and for 14 litrs ; left with 1/7 capacity left viz ; 2 ltrs
so time it will take ; 2/4 ; 1/2 hrs more
IMO A
