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12 Sep 2019, 21:37
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Difficulty:
15%
(low)
Question Stats:
81% (01:13) correct
19%
(00:50)
wrong
based on 57
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A pipe takes 3 hours to fill 2/7 of a tank. What is the time remaining (in hours) till the tank is completely filled?
A. 3
B. 3.5
C. 10.5
D. 7.5
E. 4.5
A. 3
B. 3.5
C. 10.5
D. 7.5
E. 4.5
12 Sep 2019, 22:06
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Bunuel
A pipe takes 3 hours to fill 2/7 of a tank. What is the time remaining (in hours) till the tank is completely filled?
A. 3
B. 3.5
C. 10.5
D. 7.5
E. 4.5
A. 3
B. 3.5
C. 10.5
D. 7.5
E. 4.5
The pipe takes 3 hours to fill 2/7th of the tank.
Let us assume that the total capacity of the tank is LCM(3,7) = 21 liters.
Now the tank fills 2/7th of the tank in 3 hours i.e. it fills 6 liters in 3 hours.
So, it fills 2 liters in 1 hour.
From this we get the filling rate as 2 liters per hour.
So, the total time taken will be capacity/rate of filling = 21/2 = 10.5 hours.
IMO, Answer C is correct
If you like my solution, do give kudos!
solikon
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12 Sep 2019, 22:48
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uchihaitachi
Bunuel
A pipe takes 3 hours to fill 2/7 of a tank. What is the time remaining (in hours) till the tank is completely filled?
A. 3
B. 3.5
C. 10.5
D. 7.5
E. 4.5
A. 3
B. 3.5
C. 10.5
D. 7.5
E. 4.5
The pipe takes 3 hours to fill 2/7th of the tank.
Let us assume that the total capacity of the tank is LCM(3,7) = 21 liters.
Now the tank fills 2/7th of the tank in 3 hours i.e. it fills 6 liters in 3 hours.
So, it fills 2 liters in 1 hour.
From this we get the filling rate as 2 liters per hour.
So, the total time taken will be capacity/rate of filling = 21/2 = 10.5 hours.
IMO, Answer C is correct
If you like my solution, do give kudos!
Your approach is quite right but you did not answer to the question. The question asks for time till the tank is full. You have to subtract 3 hours from you result.
So Answer should be 7.5 hours
