book Maths Puzzle Numerical Ability

The angular velocity of a tire is 25 radians/second. find the linear velocity of a tack stuck in the tread of the tire if the diameter of the tire is 2 feet.

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Rewrite the expression using positive exponents. 5AB^-2 A sum of rs 3000 has been borrowed by kiran who agrees to repay the amount in three equal annual instalments. Intially the interest rate in the scheme is 10% pa compounded annually; but after two instalments have been paid, the interest rate is increased to 15%pa effective from that year. what is the value of the last instalment?(given (100/110)^3 =0.75)