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.

[EX Q]: Question: A man performs 3/5 of the total journey by rail, 17/20 by bus and the remaining 6.5 km on foot. His total journey is :

 Option A: 125 km

 Option B: 130 km

 Option C: 135 km

 Option D: 140 km

 Option E: None
[EX A]: Option B

[EX Q]: Question: A shopkeeper sold an book offering a discount of 5% and earned a profit of 30%. What would have been the percentage of profit earned if no discount was offered?

 Option A: 140

 Option B: 120

 Option C: 130

 Option D: 136.8

 Option E: 150
[EX A]: Option D

[EX Q]: Question: A man rows his boat 85 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?

 Option A: 7 kmph

 Option B: 5 kmph

 Option C: 3 kmph

 Option D: 8 kmph

 Option E: 2 kmph
[EX A]:
Option D