A splash is heard 3.12s after a stone is dropped into a well 45 m deep. The speed of sound in air is [g=10ms^(-2)]

A splash is heard 3.12s after a stone is dropped into a well 45 m deep

1.	A splash is heard 3.12s after a stone is dropped into a well 45 m deep. The speed of sound in air is [g=10ms^(-2)]
Answer» `330ms^(-1)` `375ms^(-1)` `340MS^(-1)` `346ms^(-1)` ANSWER :B