(Dynamics)Crazy Bomb from a Helicopter

Calculus Level 3

The depth of the crater of the Taal volcano was calculated in the following manner: From a helicopter flying vertically upward at 6m/s. A small bomb was released at the instant the helicopter was 20m above the crater surface. The sound of explosion was heard 9sec later. If the speed of sound is 335m/s, what is the depth of the crater?

Pls answer this, I need the solution. The answer is 248.2m

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