A person in front of a mountain is beating a drum at the rate of 40 per minute and hears no distinct echo. If the person moves 90 m closer to the mountain, he has to beat the drum at 60 per minute to not hear any distinct echo. The speed of sound is

Question

A person in front of a mountain is beating a drum at the rate  of 40 per minute and hears no distinct echo. If the person  moves 90 m closer to the mountain, he has to beat the drum  at 60 per minute to not hear any distinct echo. The speed of  sound is

Examsnet · Accepted Answer

Correct Answer is :  360 ms‌–1

KVPY SA Exam 2018 Question Paper