the digit in the tens place of a two digit number is greater than the digit in the units place by 2 if the digit in the unit place is multiplied by 12 and 13 is added to that product we get original number find the number
The velocity of a listener who is moving away from a stationary source of sound such that the listener notices 5% apparent decrease in frequency of sound is (Velocity of sound in air = 340 m/s) A)12.5 m/s B)17 m/s C)25 m/s D)34 m/s