The beam is constructed from three boards.

The allowable shear stress that the wood can sustain is ${}_{\text{a}\text{l}\text{l}\text{o}\text{w}}=320.$ Each nail can support a shear force of $385$ lb $.$

Part A

Determine the maximum shear $v$ that the beam can support.

Express your answer to three significant figures and include appropriate units.

$$

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Part B

Determine the maximum allowable spacing $s$ of the nails used to hold the top flange to the web.

Express your answer to three significant figures and include appropriate units.

$s_t=$

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Part C

Determine the maximum allowable spacing $s$ of the nails used to hold the bottom flange to the web.

Express your answer to three significant figures and include appropriate units.

I NEED HELP PLEASE! WITH A$,$ B And C