book Maths Puzzle Numerical Ability

You are flying in an open plane at an altitude of 2304 feet and you drop a Coca Cola bottle out of the window. The bottle will hit the ground after _?_ seconds.

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book Other Question

The time required to complete a job varies inversely as the number of people working. It too 4 hours for 7 electricians to wire a buikding. How long would it have taken 3 electricians to have done the job? I need help solving this problem: -10-7x+6x=-22