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 of equal are running on parallel lines in the same direction at 45 km/hr and 36 km/hr. The faster train passes the slower train in 36 sec. The length of each train is?

Option A: 45

Option B: 88

Option C: 66

Option D: 55

Option E: 22

Answer: Option A

Question: Question: Three persons invested Rs.9000 in a joint business. The second person invested Rs.1000 more than the first and the third Rs.1000 more than second. After two years, they gained Rs.5400. How much third person will get?

Option A: Rs.2400

Option B: Rs.3600

Option C: Rs.2850

Option D: Rs.2000

Option E: Rs.3000

Answer: Option A

Question: Question: Without stoppages a train travels a certain distance with an average speed of 120 kmph and with stoppages it covers the same distance with an average speed of 90 kmph. What is the time in minutes per hour for which train stops?

Option A: 5 min/hr

Option B: 6 min/hr

Option C: 12 min/hr

Option D: 16 min/hr

Option E: 15 min/hr

Answer:
Option E