Data Sufficiency

In the following questions each question is followed by three statements I, II and III. Read the question and the statements carefully and choose your answer according to which set of statement(s) is/are sufficient to answer the question.
 1.What is the distance between city P and city Q?
 I.Two persons A and B started simultaneously from P to Q, with their speeds in the ratio 4 : 5
II.B reached P one hour earlier than A to Q.
III.The difference between speeds of A and B is 20 kmph
I and III only II and III only I and II only All I, II and III together

2.What is the rate of interest on a certain sum?
 I.The interest earned on the sum at the same rate of simple interest after 3 years is Rs.4500.
II.If the rate of interest is 2.5% more, the simple interest earned will be Rs.900 more.
 III.The amount received on the sum at the end of the 2 years at simple interest is Rs.15,000
I and II only II and III only All I, II and III together Any two statements together

3.What is the area of the rectangle?
 I.The ratio of length to breadth of the rectangle is 35 : 12.
II.The perimeter of the rectangle is 188 cm.
III.The length of diagonal of the rectangle is 74 cm
I and II only I and III only (I and II) or (II and III) Any two of the three

4.How many boys are there in the class?
I.The number of boys is 15 more than the number of girls.
 II.The average weight of boys is 41 kg and that of girls is 32 kg.
III.The average weight of all the students of the class is 37 kg
I and II only II and III only All I, II and III (I and II) or (II and III)

5.What is the profit percentage if a discount of 10% is offered on an article?
 I.Had there been no discount offered, the profit earned on the sale the article would be 40%.
 II.The discount offered on the article is 14% of the cost price.
III.The cost price of the article is Rs.1000
I only Either I or II All I, II & III together Each statement alone is sufficient