Arrange the given words Alphabetical Order and choose the one that comes first.

B. NATURE

Choose or find odd pair of words - (Saw : Wood) , (Pen : Paper) , (Author : Book) , (Chalk : Blackboard)

C. AUTHOR : BOOK

Choose or find odd word - Mackenzie , Yenisei , Michigan , Danube

C. MICHIGAN

 A person travels from P to Q at a speed of 40 kmph and returns by increasing his speed by 50%. What is his average speed for the both the trips? 

B. 48 KMPH