41. A Cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously then after how much time will the cistern get filled?
(A) 2.5 hrs
(B) 3 hrs
(C) 6.5 hrs
(D) 7.2 hrs
42. A tap can fill a tank in 6 hours. After the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
(A) 2 hrs
(B) 3 hrs 45 min
(C) 4 hrs
(D) 5 hrs 15.
43. A man can row three-quarters of a kilometer against the stream in
(A) 2
(B) 10
(C) 15
(D) 5
(E) None of these
44. A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?
(A) 1 : 2
(B) 8 : 4
(C) 8 : 3
(D) 5 : 3
(E) None of these
45. The difference between the ages of two persons is 10 years. Fifteen years ago, the elder one was twice as old as the younger one. The present age of the elder person is:
(A) 30 years
(B) 35 years
(C) 40 years
(D) 45 years
46. In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, the present age of B is:
(A) 20 years
(B) 19 years
(C) 39 years
(D) 29 years
47. 4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 8 mat-weaves in 8 days?
(A)2
(B) 4
(C) 8
(D) 16
48. In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk?
(A) 1
(B) 20
(C) 40
(D)60
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