Student: The speed of a boat in upstream is 100 kmph and the speed of the boat downstream is 130 kmph. Find the speed of the boat in still water and the speed of the stream?\nOptions:\n(A) 170, 10 kmph\n(B) 35, 27 kmph\n(C) 50, 60 kmph\n(D) 115, 15 kmph\n(E) 45, 65 kmph.
Another student: Let's say, hmmm...

User
Speed of the boat in still water = (100+130)/2 = 115 kmph. Speed of the stream = (100-130)/2 = 15 kmph Final answer: (D).
Assistant