Write, explaining how you find the volume of a regular shaped object and an irregular shaped object.

 For the volume of a regular shaped object, multiply the width and the length and then multiply the result by the height. As for the volume of an irregular shaped object, first break the object down into more regular shaped objects. Then calculate the volumes of the small regular shaped objects, and add all the volumes to get your answer.

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.