# A source A produce frequency of horn 1120 Hz. Source and observer are moving towards each other with speeds of 36 km/hr and 72 km/hr respectively.

A source A produce frequency of horn 1120 Hz. Source and observer are moving towards each other with speeds of 36 km/hr and 72 km/hr respectively. Find frequency of horn observed by the observer (speed of sound V = 330 m/s).

a. 1210 Hz
b. 1200 Hz
c. 1225 Hz
d. 1250 Hz