The rowing speed of man in still water is 20 km/h. Going downstream, he moves at the rate of 35 km/h. The rate of stream is
45 km/h
2.5 km/h
5 km/h
10 km/h
In a cricket coaching camp, 1200 children are trained out of which 900 are selected for various matches. Ratio of non-selected children to the total number of children is
300 : 120
4 : 1
1 : 4
120 : 300
A person has to cover a distance of 6 km in 45 minutes. If he covers one-half of the distance in two-thirds of the total time; to cover the remaining distance in the remaining time, his speed (in km/h) must be :
6
8
12
15
Two numbers are such that if the first be added to 5 times the second, their sum becomes 52, and if the second be added to 8 times the first, their sum becomes 65. The two numbers are:
9,7
3,7
7,9
7,3
A school has 4 section of Chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50,60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student
50.25
52.25
51.25
53.25
A cistern can be filled separately by two pipes in 12 and 16 minutes separately. If both fill pipes are opened together, when will the cistern be filled ?
A shopkeeper sold two watches for 425 each, gaining 10% on one and losing 10% on the other. Then he
neither gains nor loss
gains 1%
loses 1%
None of these
A father said to his son, "I was as old as you are at present at the time of your birth." If the father's age is 38 years now, the son's age five years black was:
14 years
19 years
33 years
38 years
Marked price of an article is 20% above the CP. He allows his customers a discount and makes a profit of 8%. The rate of discount is
10 %
12 %
20 %
18 %
In a flight of 600 km, an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by 200 km/hr and the time of flight increased by 30 minutes. The duration of the flight is :
1 hours
2 hours
3 hours
4 hours
