Others Maths Puzzle

Q. In a 100m race, if A gives B a start of 20m then A wins the race by 5 sec. If A gives B a start of 40m the race ends in a dead heat. How long does A takes to run 200m?

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Others Other Question

Q. Find ?.
83^27.3/83^1.4*83^46.8=83^31.9+?
Q. In a pile of 10 books there are 3 of History, 3 of Hindi, 2 of Maths and 2 of English. Taking from above there is an English book between a History and Maths book, a History book between a Maths and an English book, a Hindi book between an English and a Maths book, a Maths book between two Hindi books, and two Hindi books between a Maths and a History book. Book of which subject is at the sixth position from the top?