On your drive home from school, you travel 1200 m in 80 s, then 400 min 20 s. What is your average speed in m/s?

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.

The ability to make things happen is also called a. heat b. force c. matter d. energy

First to answer will be the brainliest i need the answer asap