A, B, C, D, E and Fare sitting in six chairs regularly placed around a round table. It is observed that A is between D and F.C is opposite to D, D and E are not on neighbouring chairs. Which one of the following must be true?
If it is possible to form a number with the second, the fifth and the eighth digits of the number 31549786 which is the perfect square of a two-digit even number. Which of the following will be the second digit of that even number?
A cyclist goes 40 km towards East and then turning to right he goes 40 km. Again he turn to his left and goes 20 km. After this he turns to his left and goes 40 km, then again he turns right and goes 10 km. How far is he from his starting point?