Question: A standard No . 1 0 machine screw has 2 4 threads per inch. If a man with screwdriver is turning the screw at the

A standard No.10 machine screw has 24 threads per inch. If a man with screwdriver is turning the screw at the rate of 54 turns per minute, how long a time will be required to screw in 6 such screws, each going 3/4 in. into its hole, if 1/2 min. is required to insert each screw and place screwdriver in position for starting the work? (Assume single-threaded screws)

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