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.

[EX Q]: Problem: walking at 4 / 5 of her normal speed, a worker is 10 minutes later than usual in reaching her office. the usual time ( in minutes ) taken by her to cover the distance between her home and her office is
Options: a. 30, b. 35, c. 40, d. 45, e. 50
[EX A]: c

[EX Q]: Problem: on her annual road trip to visit her family in seal beach, california, traci stopped to rest after she traveled 1 3 of the total distance and again after she traveled 1 4 of the distance remaining between her first stop and her destination. she then drove the remaining 300 miles and arrived safely at her destination. what was the total distance, in miles, from traci ' s starting point to seal beach ?
Options: a. 600, b. 300, c. 350, d. 400, e. 550
[EX A]: a

[EX Q]: Problem: in an election, candidate a got 55 % of the total valid votes. if 15 % of the total votes were declared invalid and the total numbers of votes is 560000, find the number of valid vote polled in favor of candidate ?
Options: a. 261800, b. 355800, c. 356500, d. 356800, e. 357000
[EX A]:
a