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.

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: 6 kmph

 Option B: 9 kmph

 Option C: 3 kmph

 Option D: 8 kmph

 Option E: 1 kmph
Option D

Question: (700 + 200) Ã— 4 Ã— (4 + 2) = ?

 Option A: 24500

 Option B: 21600

 Option C: 36600

 Option D: 22400

 Option E: 12500
Option B

Question: Steve traveled the first 2 hours of his journey at 35 mph and the remaining 3 hours of his journey at 80 mph. What is his average speed for the entire journey?

 Option A: 60 mph

 Option B: 56.67 mph

 Option C: 53.33 mph

 Option D: 62 mph

 Option E: 66.67 mph

Option D