Two points are located at a distance of 10 m and 15 m from the source of oscillation. The period of oscillation is 0.05 sec and the velocity of the wave is 300 m/s. What is the phase difference between the oscillations of two points ?

Question

( A ) $\frac{\pi}{6}$
( B ) $\pi$
( C ) $\frac{\pi}{3}$
( D ) $\frac{2\pi}{3}$