41
Q:

# Two pipes A and B can fill a tank in 24 hours and $1717$ hours respectively. Harihar opened the pipes A and B to fill an empty tank and some times later he closed the taps A and B , when the tank was supposed to be full. After that it was found that the tank was emptied in 2.5 hours because an outlet pipe "C" connected to the tank was open from the beginning. If Harihar closed the pipe C instead of closing pipes A and B the remaining tank would have been filled in :

 A) 2 hours B) 8 hours C) 6 hours D) 4 hours

Explanation:

Efficiency of Inlet pipe A = 4.16%       $10024$

Efficiency of Inlet pipe B = 5.83%      $1001717$

Therefore, Efficiency of A and B together = 100 %

Now, if the efficiency of outlet pipe be x% then in 10 hours the capacity of tank which will be filled = 10 *  (10 - x)

Now, since this amount of water is being emptied by 'C' at x% per hour, then

=> x = 8

Therefore, in 10 hours 20% tank is filled only. Hence, the remaining 80% of the  capacity will be filled by pipes A and B  in 80/10 = 8 hours

Q:

A and B can complete a piece of work in 15 days and 10 days respectively. They got a contract to complete the work for ₹35000. The share of A (in ₹) in the contracted money will be:

 A) 7000 B) 21000 C) 14000 D) 15000

Explanation:

5 692
Q:

A and B can complete a piece of work in 15 days and 10 days respectively. They got a contract to complete the work for ₹35000. The share of B (in ₹) in the contracted money will be:

 A) ₹15000 B) ₹14000 C) ₹21000 D) ₹7000

Explanation:

3 501
Q:

A and B can complete a piece of work in 15 days and 10 days respectively. They got a contract to complete the work for ₹75000. The share of B (in ₹) in the contracted money will be:

 A) 45,000 B) 30,000 C) 35,000 D) 40,000

Explanation:

1 592
Q:

If 16 men working 12 hours a day can complete a work in 27 days, then working for how many hours a day can 18 men complete the work in 24 days ?

 A) 9 B) 18 C) 16 D) 12

Explanation:

1 1235
Q:

If 40 men working 12 hours a day can complete a work in 8 days, then how many men working 4 hours a day can complete the same work in 16 days?

 A) 50 B) 60 C) 54 D) 45

Explanation:

2 578
Q:

A can complete a piece of work in 20 days and B can complete 20% of the work in 6 days. If they work together in how many dayscan they finish 50% of the work, if they work together

 A) 12 B) 6 C) 8 D) 9

Explanation:

4 809
Q:

Shyam can complete a task in 12 days by working 10 hours a day. How many hours a day should he work to complete the task in 8 days?

 A) 12 B) 15 C) 16 D) 14

Explanation:

2 951
Q:

5 men and 8 women can complete a task in 34 days, whereas 4 men and 18 women can complete the same task in 28 days. In how many days can the same task be completed by 3 men and 5 women?

 A) 56 B) 72 C) 64 D) 36