Give the type of measurement (nominal, ordinal, interval, ratio) for each variable. a. Length of time required

Question:

Give the type of measurement (nominal, ordinal, interval, ratio) for each variable.
a. Length of time required for a randomly chosen vehicle to cross a toll bridge.
b. Student's ranking of five cell phone service providers.
c. The type of charge card used by a customer (Visa, MasterCard, AmEx, Other).