JEE Main 12 Apr 2019 Paper 1 Solved Paper

A submarine (A) travelling at 18 km/hr is being chased along the line of its velocity by another submarine (B) travelling at 27 km/hr. B sends a sonar signal of 500 Hz to detect A and receives a reflected sound of frequency v. The value of v is close to. (Speed of sound in water = 1500 ms−1 )