Q.61. 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
Q.62. 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.
Q.63. 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?
(A) 6 min to empty
(B) 6 min to fill
(C) 8min to empty
(D) 8 min to fill
(E) None of these
Q.64. 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
Q.65. A man’s speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is :
(A) 8.5 km/hr
(B) 9 km/hr
(C) 10 km/hr
(D) 21 km/hr
(E) None of these
Q.66. A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
(A) 3 hours
(B) 5 hours
(C) 4 hours
(D) 8 hours
Q.67. 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
Q.68. If 6 years are subtracted from the present age of Gagan and the remainder is divided by 18, then the present age of his grandson Anup is obtained. If Anup is 2 years younger to Madan whose age is 5 years, then what is Gangan’s present age?
(A) 50 years
(B) 60 years
(C) 70 years
(D) 75 years
Q.69. My brother is 3 years elder to me. My father was 28 years of age when my sister was born while my mother was 26 years of age when I was born. If my sister was 4 years of age when my brother was born, then, what was the age of my father and mother respectively when my brother was born?
(A) 32 yrs, 23 yrs
(B) 33 yrs, 30 yrs
(C) 35 yrs, 31 yrs
(D) 35 yrs, 33 yrs
Q.70. A garrison of 500 men had provision for 27 days. After 3 days a reinforcement of 300 men arrived. For how many more days will the remaining food last now?
(A) 15
(B) 20
(C) 25
(D) 30
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