Two boats A and B start from two points located at a distance of 135 km. towards each other. Speed of boat A and B is 12 km/hr and 15 km/hr respectively. If A is going down stream and B is going upstream, then after how much time will they meet?
Answer & explanation
Correct answer: option 3
Let speed of stream = y km/hr
Speed of A in down stream = 12 + y
Speed of B in up stream = 15 - y
Relative speed = (12 + y) + (15 - y) = 27 km/hour
Meeting time = \(\frac{135}{27}\) = 5 hours