For the winter, a duck flies 10.0 m/s due south against a gust of wind with a speed of 2.5 m/s. what is the resultant velocity of the duck?
a. 12.5 m/s south
c. 7.5 m/s south
b. 12.5 m/s south
d. 7.5 m/s south

When y’all answer can y’all explain too !

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Katie wants to collect over 100 seashells. she already has 34 seashells in her collection. each day, she finds 12 more seashells on the beach. katie can use fractions of days to find seashells. write an inequality to determine the number of days, dd, it will take katie to collect over 100 seashells.