instruction:
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:
Question: Two trains, each 100 m long, moving in opposite directions, cross other in 6 sec. If one is moving twice as fast the other, then the speed of the faster train is?

Option A: 80 km/hr

Option B: 66 km/hr

Option C: 60 km/hr

Option D: 67 km/hr

Option E: 22 km/hr
answer:
Option A

question:
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
answer:
Option D

question:
Question: A man shows his friend a woman sitting in a park and says that she the daughter of my grandmother's only son.What is the relation between the two

Option A: brother sister relation

Option B: sister sister-in-law relation

Option C: daughter father relation

Option D: daughter mother relation

Option E: grand daughter father relation
answer:
Option A