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: 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
[EX A]: Option A

[EX Q]: Question: When the no.7y86038 is exactly divisible by 11, then the smallest whole no.in place of y?

 Option A: 3

 Option B: 4

 Option C: 6

 Option D: 7

 Option E: 9
[EX A]: Option A

[EX Q]: Question: There are 18 stations between Hyderabad and Bangalore. How many second class tickets have to be printed, so that a passenger can travel from any station to any other station?

 Option A: 288

 Option B: 277

 Option C: 786

 Option D: 791

 Option E: 380
[EX A]:
Option E