$\"\"$

An air craft carried made a trip to guam and back.

The trip there took $\"\"$ hours and the trip back took $\"\"$ hours.

Average speed on the return trip is $\"\"$ .

Find average speed of the trip to guam.

Let the average speed of the wind be $\"\"$ kilometers per hour.

Formula for distance is $\"\"$ .

Distance with trip to guam is $\"\"$

Distance with trip to back is $\"\"$

The distances going and coming are equal.

Therefore, $\"\"$

$\"\"$ (Simplify)

$\"\"$ (Divide each side by $\"\"$ )

$\"\"$ (Cancel common terms)

Therefore, the average speed of the wind is $\"\"$ .

$\"\"$

Option B is right choice.