Maths Maths Puzzle Category

.A car traveling with uniform speed. There r 15 poles. A car travel from 1 to 10th pole in 10 seconds. the poles are equally spaced. then how many seconds it takes to reach the 15th pole?

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Maths Other Question

) A, B & C participate in a race & one of them wins. They belong to
three communities-M, N,
O. O always speak the truth, N always lie and M alternate. Each of A,
B & C belongs to one community.

A SAYS:
1. I would have won the race if C had not interfered me at the last movement.
2. C always speaks truth.
3. C is the winner.

B SAYS:
1. A wins the race.
2. C is not a 'N'.

C SAYS:
1. I hadn't interfered with A at the last movement.
2. B wins the race.

Tell, who's who?
What is the next number of the following sequence
18, 17, 22, 12, 15, 23, 41, 21, ?