1. A man rows a boat 18 kilometers in 4 hours downstream and returns upstream in 12 hours. The speed of the stream (in km per hour) is: (2)
(1) 1
(2) 1.5
(3) 2
(4) 1.75
(5) None of these
2. The present age of a father is 3 years more than three times the age of his son. Three years hence, father’s age will be 10 years more than twice the age of the son. The father’s age was three years below to the present is: (5)
(1) 33 years
(2) 39 years
(3) 45 years
(4) 40 years
(5) None of these
3. A and B can together finish a work in 30 days. They worked together for 20 days and then B left. After another 20 days. A finished the remaining work. In how many days A alone can finish the job? (2)
(1) 50
(2) 60
(3) 48
(4) 54
(5) None of these
4. Two pipes A and B can separately fill a cistern in 60 minutes and 75 minutes 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 minutes. In how much Time the third pipe alone can empty the cistern? (2)
(1) 110 minutes
(2) 100 minutes
(3) 120 minutes
(4) 90 minutes
(5) None of these
5. 40 litres of a mixture of milk and water contains 10% of water, the water to be added, to make the water content 20% in the new mixture is: (2)
(1) 6 litres
(2) 6.5 litres
(3) 5.5 litres
(4) 5 litres
(5) None of these
