A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold?

March 28, 2020 – by Arif Khan 0

A. 480 liters
B. 600 liters
C. 720 liters
D. 800 liters

Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 40 minutes. How long will it take to fill the cistern if all the three are opened at the same time?

March 28, 2020 – by Arif Khan 0

A. 19 1/7 min
B. 15 1/7 min
C. 17 1/7 min
D. 7 1/7 min

March 28, 2020 – by Arif Khan 0

A. 9 min
B. 10 min
C. 11 min
D. 12 min

March 28, 2020 – by Arif Khan 0

A. 9 1/4 min
B. 11 1/4 min
C. 7 1/4 min
D. 8 1/2 min

March 28, 2020 – by Arif Khan 0

A. 7 hours
B. 8 hours
C. 14 hours
D. 28 hours

March 28, 2020 – by Arif Khan 0

A. -2, -1/2
B. 4, -1
C. 4, 1
D. -2, 5/2

March 28, 2020 – by Arif Khan 0

A. If a > b
B. If a ≥ b
C. If a < b
D. If a ≤ b.

March 28, 2020 – by Arif Khan 0

A. -6, 3
B. 3, -2/3
C. -5, 2
D. -9, 2

March 28, 2020 – by Arif Khan 0

A. -6, 7
B. -8, 7
C. 14, -3
D. -7, 6

March 28, 2020 – by Arif Khan 0

A. If a > b
B. If a ≥ b
C. If a < b
D. If a ≤ b