Question

Ateacher enters a classroom from front door while a student from back door. There are 13 equidistant rows of
benches in the classroom. The teacher releases N.o the laughing gas, from the first bench while the student
releases the weeping gas (C&H OBr) from the last bench. At which row will the students starts laughing and
weeping simultaneously.
(A)7
(B) 10
(C)9
(D)8
​

Answer 1

Answer:

the answer is 7 when the students starts laughing and weeping simultaneously.

Answer 2

Answer:Option C i.e 9

Explanation:

r1 / r2 = √m2 / m1