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I need help with a few introductory physics prelab questions

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I need help with a few introductory physics prelab questions.

1) An object moves 15 meters in 3 seconds. What is its velocity (in m/s)?

2)What is the velocity (in cm/s) of an object which moves 44 m in 2 s?

3) The charge of an electron is -1.60x10-19 C. Determine the charge to mass ratio of the electron (in 1011 C/kg). (Hint: divide the electron's charge by its mass; the answer is a negative number with a positive exponent)

4) What is the average velocity (in kilometers per hour) of a cart that travels 100 km in 5 hours?