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Basic Arithmetic

Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill cistern. How much time will be taken by A to fill the cistern separately?

March 28, 2020 – by Arif Khan 0

A. 1 hr
B. 2 hrs
C. 6 hrs
D. 8 hrs

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in?

March 28, 2020 – by Arif Khan 0

A. 1 13/17 hours
B. 2 8/11 hours
C. 3 9/17 hours
D. 4 1/2 hours

Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P, Q and R respectively. What is the proportion of solution R in the liquid in the tank after 3 minutes?

March 28, 2020 – by Arif Khan 0

A. 5/11
B. 6/11
C. 7/11
D. 8/11

One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill tank in 36 min, then the slower pipe alone will be able to fill the tank in?

March 28, 2020 – by Arif Khan 0

A. 81 min
B. 108 min
C. 144 min
D. 192 min

Two pipes A and B can separately fill a cistern in 60 min and 75 min respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 min. In how much time, the third pipe alone can empty the cistern?

March 28, 2020 – by Arif Khan 0

A. 90 min
B. 100 min
C. 110 min
D. 120 min

A tap can fill a tank in 6 hours. After half the tank is filled three more similar taps are opened. What is the total time taken to fill the tank completely?

March 28, 2020 – by Arif Khan 0

A. 3 hrs 15 min
B. 3 hrs 45 min
C. 4 hrs
D. 4 hrs 15 min

A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

March 28, 2020 – by Arif Khan 0

A. 6 min. to empty
B. 6 min. to full
C. 9 min. to empty
D. 9 min. to full

A tank is filled in eight hours by three pipes A, B and C. Pipe A is twice as fast as pipe B, and B is twice as fast as C. How much time will pipe B alone take to fill the tank?

March 28, 2020 – by Arif Khan 0

A. 24 hours
B. 28 hours
C. 32 hours
D. 36 hours

Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled?

March 28, 2020 – by Arif Khan 0

A. 2
B. 2.5
C. 3
D. 3.5

Pipe A can fill a tank in 6 hours. Due to a leak at the bottom, it takes 9 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?

March 28, 2020 – by Arif Khan 0

A. 16 hours
B. 15 hours
C. 18 hours
D. 17 hours

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