Two boats A and B start to run from point A and point B in opposite direction. The distance between both boats is 120 km. The speed of boat A is x km/hr, speed of boat B is x + 4 km/hr and the speed of stream is y km/hr. If they take 4 hours to meet each other then find the value of x?
1
11 km/hr
2
13 km/hr
3
15 km/hr
4
17 km/hr
5
None of these