Instructions: Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
Input: Problem: the average speed of a car is 1 4 / 5 times the avg speed of a bike. a tractor covers 575 km in 23 hrs. how much distance will the car cover in 4 hrs if the speed of the bike is twice speed of the tractor ?
Options: a. 300 km, b. 320 km, c. 360 km, d. 390 km, e. 400 km
Output:
c