You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[Q]: Question: A train running at the speed of 60 km/hr crosses a pole in 21 seconds. What is the length of the train?

Option A: 350 m

Option B: 278 m

Option C: 876 m

Option D: 150 m

Option E: 267 m
[A]: Option A

[Q]: Question: A boat can travel with a speed of 25km/hr in still water. If the speed of the stream is 5km/hr, find the time taken by the boat to go 120km downstream.

Option A: 1 hr

Option B: 2 hrs

Option C: 3 hrs

Option D: 4 hrs

Option E: 5 hrs
[A]: Option D

[Q]: Question: The average (arithmetic mean) of the 5 positive integers k, m, r, s, and t is 10, and k < m < r < s < t. If t is 20, what is the greatest possible value of the median of the 5 integers?

Option A: 16

Option B: 18

Option C: 13

Option D: 20

Option E: 22
[A]:
Option C